P. Scheib's research while affiliated with Technische Universität Braunschweig and other places
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Publications (7)
We present a Raman spectroscopic investigation of the herbertsmithite ZnCu3(OH)6Cl2, a realization of a Heisenberg s=1/2 antiferromagnet on a perfect kagome lattice. Focusing on its magnetic excitation spectrum we find two components, a high-temperature quasielastic signal and a low temperature, broad maximum. The latter has a linear low-energy slo...
We present a Raman spectroscopic investigation of the Herbertsmithite
ZnCu3(OH)6Cl2, the first realization of a Heisenberg s=1/2 antiferromagnet on a
perfect kagome lattice. The magnetic excitation spectrum of this compound is
dominated by two components, a high temperature quasi elastic signal and a low
temperature, broad maximum. The latter has a...
Raman scattering in the spin-crossover system FepmdH 2 OAuCN 2 2 ·H 2 O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spi...
The effect of chemical treatment on physical and chemical properties, i.e., pore diameter, porosity, specific surface area, and chemical bonding of electrochemically formed mesoporous silicon were investigated by using of nitrogen sorption isotherm, scanning electron microscopy, and Fourier transform infrared spectroscopy. The adsorption isotherms...
We report inelastic light scattering experiments on FeCr2S4, which shows colossal magnetoresistance (CMR) effects around TC≈170 K. Several distinct features have been observed: (i) anomalies in phonon frequencies and linewidths around TC, (ii) the vanishing of one-magnon excitation close to 0.83 TC, and (iii) the presence of an electronic backgroun...
Raman scattering experiments on CdCr2S4 single crystals show pronounced
anomalies in intensity and frequency of optical phonon modes with an onset
temperature T*=130 K that coincides with the regime of giant magnetocapacitive
effects. A loss of inversion symmetry and Cr off-centering are deduced from the
observation of longitudinal optical and form...
The effect of surface degradation of the thermolectric cobaltite on Raman
spectra is discussed and compared to experimental results from Co3O4 single
crystals. We conclude that on NaCl flux grown NaxCoO2 crystals a surface layer
of Co3O4 easily forms that leads to the observation of an intense phonon around
700 cm-1 [Phys. Rev. B 70, 052502 (2004)]...
Citations
... The kagome lattice has long been heralded as one of the prototypical frustrated lattices in condensed matter physics, and was historically valued for contributions in the search for insulating quantum spin liquids. [1][2][3][4][5] Fueled in part by the relatively recent discovery of the AV 3 Sb 5 kagome superconductors [6][7][8][9], research into kagome metals has accelerated dramatically. An innate connection between the kagome motif and the electronic structure drives the manifestation of an electronic structure hosting Dirac points, flat bands, and Van Hove singularities. ...
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... Electrochemically induced nanoporosity in silicon (np-Si) has been intensively studied both with regard to fundamental and applied aspects after its accidental discovery at Bell labs in 1956 [16,17,18]. It results in specific surface areas of 200 -500 m 2 /g [19,20,21,22], tailorable by the fabrication parameters [23,24]. Nanoporous Si as a nanostructured scaffold offers a wide range of applications for the exploration of the fundamentals of spatially confined condensed-matter systems [25,26,27,28,29,30]. ...
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... The IR active phonon modes of FeCr 2 S 4 have been investigated by a number of groups [147][148][149], however, with no special focus on the low-temperature orbital ordering transition or on the magnetic transition at the critical temperature T m . Raman active modes were reported by Choi et al. [150], only reporting anomalies in phonon frequencies and excitation linewidths around the FM ordering temperature T C . In a recent far-infrared spectroscopy study, the detailed temperature dependence of all phonon eigenfrequencies was studied in detail, when crossing all critical phase transitions [146]. ...
... However, heat capacity is found not to be sensitive to an antiferromagnetic transition, see for example [22], thus further studies such as NMR are necessary to identify the temperature of magnetic transition in κ-Hg-Cl. On the other hand, to clarify magnetic low-temperature state of the studied materials much information can be received from magnetic Raman scattering Raman scattering was previously successfully used to study spinon excitations in both inorganic kagome-lattice [23] and BEDT-TTF-based triangular lattice [24,25] spin liquid candidates. ...
... Relaxor-like behaviour can actually appear in any heterogeneous semiconductor as a result of the Maxwell-Wagner effect, a conductive artefact unrelated to relaxors 12,13 . The low-frequency divergence of the imaginary permittivity 3-5 is indeed consistent with direct-current (d.c.) conductivity in a Maxwell-Wagner system 13 . ...
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... P1 and P2 occurred due to the vibrations of O atoms in the Co-O and Ca-O planes of the Ca 2 CoO 3 layers, respectively [49,50], and corresponds to the F 2g phonon [51]. Whereas, P3 and P4 to E 1g and A 1g phonon, respectively [52]. The Raman intensity decreases and the peak shifts toward the higher wavelength with an increase in Li ? ...
