Jess H. Brewer

Jess H. Brewer
University of British Columbia - Vancouver | UBC · Department of Physics and Astronomy

B.S., M.A., Ph.D.
See https://opeer.org & https://jick.net/nukes & https://jick.net/futures etc. Trying to save us from our own folly.

About

591
Publications
38,165
Reads
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13,093
Citations
Additional affiliations
January 2003 - present
Toyota Central R & D Labs., Inc.
Position
  • Collaboration with Jun Sugiyama of Toyota Central R & D Labs., Inc.
June 1997 - May 1998
Columbia University
Position
  • Visiting Professor
Description
  • Sabbatical year
January 1994 - present
Kurchatov Institute
Position
  • Collaboration with V.G. Storchak of Kurchatov Institute
Education
September 1969 - June 1972
University of California, Berkeley
Field of study
  • High Energy Physics
September 1967 - June 1969
September 1963 - June 1967
Trinity College
Field of study
  • Physics, minor in English

Publications

Publications (591)
Article
Complementary to bulk synthesis, here we propose a designer lattice with extremely high magnetic frustration and demonstrate the possible realization of a quantum spin liquid state from both experiments and theoretical calculations. In an ultrathin (111) CoCr2O4 slice composed of three triangular and one kagome cation planes, the absence of a spin...
Article
Full-text available
(This is an open access paper.) An A-type antiferromagnet, NaNiO2, was examined by means of positive muon spin rotation and relaxation (μ+SR) measurements and first-principles calculations based on a density functional theory (DFT). Below TN = 20 K, a clear muon spin precession signal was observed in the μ+SR time spectrum recorded under zero field...
Article
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The emission of muonium (μ+e– ) atoms into vacuum from silica aerogel with laser ablation on its surface was studied with various ablation structures at room temperature using the subsurface muon beams at TRIUMF and Japan Proton Accelerator Research Complex (J-PARC). Laser ablation was applied to produce holes or grooves with typical dimensions of...
Article
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(This is an open access paper. Go to https://doi.org/10.1103/PhysRevResearch.2.033161) Positive- and negative-muon spin rotation and relaxation (µ±SR) was first used to investigate fluctuations of nuclear magnetic fields in an olivine-type battery material, LiMnPO4 , in order to clarify the diffusive species, namely, to distinguish between a µ+ hop...
Preprint
Full-text available
The emission of muonium ($\mu^+e^-$) atoms into vacuum from silica aerogel with laser ablation on its surface was studied with various ablation structures at room temperature using the surface muon beams at TRIUMF and Japan Proton Accelerator Research Complex (J-PARC). Laser ablation was applied to produce holes or grooves with typical dimensions o...
Article
Vilão et al. (Phys. Rev. B 96, 195205 (2017) and Phys. Rev. B 99, 195206 (2019)) have reported positive muon spin rotation/relaxation (μ+SR) experiments on various insulating metal oxides, solar cell materials, and alloyed Ge. They note the presence of a separate early component in the μ+ polarization time dependence which relaxes more rapidly than...
Article
Full-text available
Vilão et al. (Phys. Rev. B 96, 195205 (2017) and Phys. Rev. B 99, 195206 (2019)) have reported positive muon spin rotation/relaxation (μ + SR) experiments on various insulating metal oxides, solar cell materials, and alloyed Ge. They note the presence of a separate early component in the μ + polarization time dependence which relaxes more rapidly t...
Article
Full-text available
(This is an open access paper.) The ferromagnetic (FM) nature of Nd2Fe14B has been investigated with muon spin rotation and relaxation (μ+SR) measurements on an aligned, sintered plate-shaped sample. A clear muon spin precession frequency (fFM) corresponding to the static internal FM field at the muon site showed an order parameter-like temperature...
Preprint
(accepted for publication in Physical Review Materials on May 24, 2019) The ferromagnetic (FM) nature of Nd2Fe14B has been investigated with muon spin rotation and relaxation ({\mu}^+SR) measurements on an aligned, sintered plate-shaped sample. A clear muon spin precession frequency (f_{FM}) corresponding to the static internal FM field at the muon...
Article
Full-text available
[This is an open access paper.] In order to study the mechanism determining the desorption temperature (Td) of hydrogen storage materials, we have measured positive muon spin rotation and relaxation (μ⁺SR) in MgH2 over a wide temperature range including its Td. The pressure in the sample cell due to desorbed H2 was measured in parallel with the μ⁺...
Article
Full-text available
Superconductivity and ferromagnetism in a number of uranium-based materials come from the same f-electrons with a relatively large effective mass, suggesting the presence of a band of heavy quasiparticles, whose nature is still a mystery. Here, UGe2 dynamics in both ferromagnetic and paramagnetic phases is studied employing high-field μ⁺SR spectros...
Conference Paper
Full-text available
(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011009) The magnetic ground state of the A-site ordered chromium perovskites, ACu3Cr4O12 with A = Y, La, Eu, and Lu has been investigated with μ+SR using powder samples prepared by a high-pressure technique. Weak transverse field measurements revealed that the four compounds enter into a m...
Conference Paper
Full-text available
(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011011) In this work we present a combination of zero-field and high transverse-field muon spin rota- tion/relaxation (μ+SR) measurements. The current μ+SR Knight-shift measurements clearly shows that Ca3Co2O6 display strong spin correlations even at room-temperature. Further, several anom...
Conference Paper
Full-text available
(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011004) In order to study the antiferromagnetic (AF) nature of a novel two-dimensional triangular compound, LiCrSe2, we have measured muon spin rotation and relaxation (μ+SR) spectra using a powder sample down to 2 K. A bulk AF transition was clearly observed at TN = 30 K by weak transvers...
Article
Full-text available
The microscopic magnetic nature of the A-site ordered chromium perovskites CaCu3Cr4O12 and LaCu3Cr4O12 and their solid-solution system, Ca1−xLaxCu3Cr4O12, with x=0.2, 0.4, and 0.8, has been studied with muon spin rotation and relaxation (μ+SR) measurements down to 2 K using a powder sample. For CaCu3Cr4O12, μ+SR revealed the formation of static ant...
Article
Full-text available
(This is an OPEN ACCESS paper, go to DOI: 10.1103/PhysRevB.97.024416) The microscopic magnetic nature of the A-site ordered chromium perovskites CaCu3Cr4O12 and LaCu3Cr4O12 and their solid-solution system, Ca1−xLaxCu3Cr4O12, with x = 0.2, 0.4, and 0.8, has been studied with muon spin rotation and relaxation (μ+SR) measurements down to 2 K using a...
Article
We have investigated the magnetic ground state of a novel one-dimensional compound, NaCr2O4, in which Cr2O4 double chains, i.e. zig-zag chains are aligned parallel to the b-axis, by means of both muon-spin rotation and relaxation (μ+SR) and neutron diffraction (ND) measurements. The μ+SR results reveal the formation of static antiferromagnetic orde...
Article
Angle-resolved photoelectron spectroscopy has been used to follow the valence band and near Fermi edge electronic band structure in the quasi-1D compound NaV2O4. In this current study we have acquired the very first high-quality, high-resolution ARPES data from this material. Our data clearly reveal two distinct dispersive bands that cross the Ferm...
Article
Full-text available
High transverse magnetic field and zero field muon spin rotation and relaxation measurements have been carried out in a lightly oxygen-doped high-T c parent compound La 2 CuO 4 in a temperature range from 2 K to 300 K. As in the stoichiometric compound, muon spin rotation spectra reveal, along with the antiferromagnetic local field, the presence of...
Article
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Heavy fermion (HF) compounds are well known for their unique properties, such as narrow bandwidths, loss of coherence in a metal, non-Fermi-liquid behaviour, unconventional super-conductivity, huge magnetoresistance etc. While these materials have been known since the 1970s, there is still considerable uncertainty regarding the fundamental mechanis...
Article
Full-text available
Heavy fermion (HF) compounds are well known for their unique properties, such as narrow bandwidths, loss of coherence in a metal, non-Fermi-liquid behaviour, unconventional super-conductivity, huge magnetoresistance etc. While these materials have been known since the 1970s, there is still considerable uncertainty regarding the fundamental mechanis...
Article
The magnetic nature of a metallic two-dimensional triangular compound, CrSe2, has been investigated by muon spin rotation and relaxation (\mu^+SR) measurements using both powder and single crystal samples. It is found that CrSe2 enters into a static antiferromagnetic (AF) ordered state below 157~K (=T\rm N). Furthermore, the AF state is slightly ch...
Article
Full-text available
High transverse magnetic field and zero field muon spin rotation and relaxation measurements have been carried out in a lightly oxygen-doped high-Tc parent compound La2CuO4 in a temperature range from 2 K to 300 K. As in the stoichiometric compound, muon spin rotation spectra reveal, along with the antiferromagnetic local field, the presence of an...
Article
Full-text available
Seriously? You want to see an Abstract for a Book Review? Twitter has truncated your attention!
Article
Full-text available
In order to elucidate the dependence of the magnetic ground state on the Ca content (x) in Sr1−xCaxCo2P2 (0 ≤ x ≤ 1, ThCr2Si2-type structure), we have performed muon spin rotation and relaxation (μ+SR) experiments on Sr1−xCaxCo2P2 powder samples mainly in a zero applied field. The end member compound, SrCo2P2, is found to be paramagnetic down to 19...
Article
Full-text available
The magnetic nature of a novel one-dimensional compound NaCr2O4 with zigzag CrO2 chains has been studied by muon spin rotation and relaxation (μ+SR) and neutron diffraction (ND). It is found that NaCr2O4 undergoes an antiferromagnetic transition at TN = 125 K, below which the Cr moments in each zigzag chain align ferromagnetically along the c-axis...
Article
Full-text available
The microscopic magnetic nature of a novel A-site ordered chromium perovskite, LaCu3Cr4O12, has been studied with muon spin rotation and relaxation (μ+SR) measurements down to 2 K using a powder sample. Magnetization and resistivity measurements indicated the presence of a magnetic transition at Tm = 225 K together with a metal-to-metal transition....
Article
We have found that the erbium magnetic moment is so large that in ErRhâBâ it can relax muon polarization in times shorter than can be resolved by a typical ..mu..SR apparatus. The complete relaxation signal is resolved at temperatures above 50K only because of rapid fluctuation of the erbium moment, which partially decouples it from the muon's mome...
Article
Through its asymmetric decay, the positive muon acts as a sensitive ; detector of the interactions of its spin with the medium in which it comes to ; rest. Development of the $mu$$sup +$SR spectroscopy technique is described, and ; recent applications of the $mu$$sup +$ as a probe are discussed. Results for ; hyperfine fields in ferromagnets and im...
Article
The magnetic properties of LaâCuO/sub 4+/delta// (/delta//le/0.13) have been determined by means of muon-spin rotation and relaxation in transverse and zero external fields. A fraction /ital f//sub SC/=0.6 of the sample was found to be superconducting with /ital T//sub /ital c//=35(1) K and extrapolated penetration depth /lambda/(0)=4200 A (powder...
Article
Full-text available
In order to study the variation of a microscopic internal magnetic field with the Ca content (x), we have systematically measured muon-spin rotation and relaxation (μ+SR) spectra for Sr1−xCaxCo2P2 (0 ≤ x ≤ 1) powder samples mainly in a zero external field (ZF). As x increases from 0, a Pauli- paramagnetic phase is observed even at the lowest T meas...
Article
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I have built a "demonstration" website at http://oPeer.org to illustrate how peer review and publication might be improved relative to the current model, which was designed and implemented in an era when scientific communication was either face-to-face or relied upon human delivery of ink marks on dead trees.
Article
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Encouraged by predictions of simple Fermi liquid behavior in the overdoped versions of high temperature superconductors (HTcSC) based on CuO2 planes, we have performed TF-μ+ SR experiments on several high quality oriented crystal mosaics of Tl2Ba2CuO6+x ("Tl-2201") in the vortex-lattice state where the magnetic penetration depth λ can be extracted...
Conference Paper
Full-text available
The origin of a pseudogap in the underdoped phase of cuprates has become one of the leading issues in understanding the mechanism(s) of high-Tc superconductivity. Several experiments (i.e. polarized neutron diffraction studies) support theoretical models based on the circulating current (CC) picture. These CC models suggest a novel ordered phase fo...
Conference Paper
Full-text available
It has long been believed that coexistence among ferromagnetic ordering, superconductivity or heavy-fermion behaviour is impossible, as the former supports parallel spin alignment while the latter two phenomena assume a spin-singlet configuration. This understanding has recently been challenged by a number of observations in uranium intermetallic s...
Conference Paper
Full-text available
Certain magnetic materials may contain spin polarons (SP) — tiny, stable ferromagnetic "droplets" in a paramagnetic or weakly ordered "sea" of more random spins. The positive muon may become associated with SP, giving a unique window on their properties. In this experiment the µ + SR spectroscopy of "avoided level crossing resonance" (µALCR) was us...
Article
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In order to study the phase diagram from a microscopic viewpoint, we have measured wTF- and ZF-μ+SR spectra for the Sr1−xCaxCo2P2 powder samples with x=0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1. Due to a characteristic time window and spatial resolution of μ+SR, the obtained phase diagram was found to be rather different from that determined by magnetizati...
Article
Full-text available
In order to elucidate the magnetic nature of K2NiF4-type 3d transition metal oxides, we have measured μ+SR spectra for Sr2VO4, LaSrVO4, and Sr2CrO4 using powder samples. ZF- and wTF-μ+SR measurements propose that Sr2VO4 enters into the static antiferromagnetic (AF) order phase below 8 K. In addition, TF-μ+SR measurements evidence that the transitio...
Article
Full-text available
In order to clarify the reason why the hydrogen desorption temperature (Td) of MgH2 is lowered by milling, we have studied the change in a local nuclear magnetic field with temperature by means of μ+SR. We have found a very clear oscillation in the ZF-spectrum at 2 K for the "milled" and "milled with Nb2O5" samples, while such oscillation is weaker...
Article
Full-text available
In order to investigate the microscopic magnetic nature of a sodium phospho-olivine, we have measured μ+SR spectra for NaxFePO4 using a powder sample in the temperature range between 2 and 500 K. ZF-μ+SR measurements below 200 K at TRIUMF showed the appearance of static magnetic order below TN= 61 K, where the susceptibility-vs.-temperature curve e...
Article
Full-text available
In order to elucidate the magnetic nature for a novel one-dimensional zigzag chain compound, NaCr2O4, we have measured μ+SR spectra using a powder sample in the temperature range between 2 and 200 K. Weak transverse field (wTF-) μ+SR measurements indicated that the whole volume of the sample enters into an atiferromagnetic phase below TN = 125 K. T...
Article
Full-text available
In order to study the phase diagram from a microscopic viewpoint, we have measured wTF- and ZF-$\mu^+$SR spectra for the Sr$_{1-x}$Ca$_x$Co$_2$P$_2$ powder samples with $x=0$, 0.2, 0.4, 0.5, 0.6, 0.8, and 1. Due to a characteristic time window and spatial resolution of $\mu^+$SR, the obtained phase diagram was found to be rather different from that...
Article
Full-text available
Muon spin rotation measurements supported by magnetization experiments have been carried out in a stoichiometric high-$T_c$ parent compound La$_2$CuO$_4$ in %the a temperature range from 2~K to 340~K and in transverse magnetic fields up to 5~T. Along with the antiferromagnetic local field, muon spin rotation spectra indicate presence of an addition...
Article
Full-text available
To investigate the microscopic magnetic nature of phospho-olivines, we have measured positive muon-spin rotation and relaxation (μ+SR) spectra for NaxFePO4 and FePO4, using powder samples in the temperature range between 2 and 200 K. For Na0.7FePO4, μ+SR measurements under zero external field (ZF) showed the appearance of static magnetic order belo...
Article
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Muon spin rotation/relaxation ($\mu$SR) experiments have revealed many interesting features of high temperature superconductivity (HTSC) in the underdoped cuprates, where superconductivity is closely related to, and sometimes coexistent with, disordered or fluctuating magnetic and charge excitations. Such complications should be absent in overdoped...
Article
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I will first review the earlyhistory of muon spin rotation/relaxation/resonance (μSR), from its origins in elementary particle physicsthrough its applications in fundamental physics, chemistry and materials science. Then I will review the more recentdevelopment of μSR facilities, modern muon beams and advanced techniques that have made μSR an indis...
Article
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In strongly correlated materials, cooperative behavior of the electrons causes a variety of quantum ordered states that may, in some cases, coexist. It has long been believed, however, that such coexistence among ferromagnetic ordering, superconductivity and heavy-fermion behavior is impossible, as the first supports parallel spin alignment while t...
Article
Full-text available
In order to elucidate themagnetic ground state of Sr2VO4, we havemeasured muon spin rotation and relaxation (μ+SR) spectra of a powder sample in the temperature range between 1.8 and 140 K. As a result, we have clarified that the transition at 105 K is not magnetic but structural and/or electric in origin and found the appearance of static antiferr...
Article
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Muon spin rotation ($\mu^+$SR) experiments have been carried out in the heavy fermion compound UBe$_{13}$ in the temperature range from 0.025 K to 300 K and in magnetic fields up to 7 T, supported by resistivity and magnetization measurements. The $\mu^+$SR spectra are characteristic of formation of a spin polaron which persists to the lowest tempe...
Article
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Cation-ordered Li[Ni1/2Mn3/2]O4 with a P4332 space group (CO-LNMO) and "cation-disordered" (CDO) LNMO are thought to be the state-of-the-art materials for lithium-ion batteries. However, in contrast to CO-LNMO, the crystal structure and electrochemical reaction scheme of CDO-LNMO are not fully understood. We have measured the muon-spin rotation and...
Article
Full-text available
Materials that exhibit colossal magnetoresistance (CMR) have attracted much attention due to their potential technological applications. One particularly interesting model for the magnetoresistance of low-carrier-density ferromagnets involves mediation by magnetic polarons (MP)-electrons localized in nanoscale ferromagnetic 'droplets' by their exch...
Article
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The quasi-one-dimensional hollanditevanadateK2V8O16is believedtohavea spin-singlet-like transitionat ≈ 170 K.Weinvestigateda polycrystalline sampleof K2V8O16 using zero-field μSR.Paramagnetic electronic fluctuations, manifested as a relaxation of the muon polarization function, exist at all temperatures. There are only smooth and slight changes in...
Article
Full-text available
Diffusion of Li+ ionsin solidsisa basic principle behindthe operationof Li-ion batteries. Suchdiffusive behavior is represented by the diffusion equation (Fick's law), J = −D × δϕ/δx, where J is the diffusion flux, D is the self diffusion coeffcient, ϕ is the concentration, and x is the position. Although D of Li+ ions(DLi)in solids is usually eval...
Article
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By means of longitudinal field muon-spin spectroscopy, we have found a clear critical slowing down caused by spin fluctuation of Ho moments in the icosahedral quasicrystal (QC), i-ZnMgHo, with freezing temperature (Tf =1.95 K), for which the susceptibility showed an anomaly at5K. The difference is attributed to crystalline elec-tric field (CEF) eff...
Article
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In order to clarify the carrier density dependence of the microscopic magnetic nature in NaxCoO2 * yH2O, we have performed a μ+SR study of H2O and D2O absorbed samples. Based on the ZF-μ+SR measurements, there was no clear difference between the two superconducting phases (SCI and SCII). This is also likely to exclude the exotic scenario for the su...
Article
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The magnetic properties of the olivine-type compounds LiMPO4 (M = Mn, Co, Ni) are probed using muon spin rotation/relaxation (μSR). These materials pose an appealing magnetic structure and a high -potential technological interest as cathode materials for future rechargeable Li-ion batteries. The LiMPO4 family of compounds consists of a corner-shari...