L. W. Zhou's research while affiliated with Temple University and other places
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Publications (11)
Results of 5d-5f resonant photoemission studies on the related series of uranium intermetallic compounds, U(SnxIn1−x)3 for x = 1.0, 0.5 and 0.0 are presented. Various features seen in the spectra are analyzed in terms of calculated partial densities of states. With the help of difference spectra between on and off resonance spectra obtained at phot...
Hybridization of the f electrons with the conduction electrons and f electrons on adjacent ions drives the rich non-magnetic to magnetic behavior observed within the lighter actinides and intermetallic compounds containing these elements. Within and near this transition region, many of the very challenging problems associated with narrow band pheno...
UGa 3 is an antiferromagnetic system with a Néel temperature T N =67 K and UGe 3 is a weakly paramagnetic system with a nearly temperature‐independent magnetic susceptibility and a slightly enhanced low‐temperature electronic specific heat coefficient of 20 mJ/mole K<sup>2</sup>. The room‐temperature lattice constant and the temperature dependence...
The recent discovery of anomalous properties associated with extremely narrow f-band character in the electronic density of states in the vicinity of the Fermi energy has stimulated considerable interest in these systems. Some particularly exciting recent discoveries have emerged from studies of the magnetic and electronic properties of cerium- and...
The temperature dependence of the magnetic susceptibility, the low-temperature specific heat, and the field dependence of the high-field magnetization were measured for the pseudobinary system U(In1-xSnx)3 for 0x1. The results show a clear evolution from long-range antiferromagnetism for x<0.45 (In rich) to a heavy-fermion region for 0.45x0.80 and...
The temperature dependence of the magnetic susceptibility, the low-temperature specific heat, and the field dependence of the high-field magnetization were measured for the pseudobinary system U(Inââ/sub x-italic/Sn/sub x-italic/)â for 0< or =x-italic< or =1. The results show a clear evolution from long-range antiferromagnetism for x-italic0.8 (Sn...
The temperature and magnetic field dependence of the specific heat and the temperature dependence of the resistivity have been measured for the pseudobinary U(In, Sn)3 system. The Néel temperature is depressed to zero by 45% Sn substitution while the specific heat coefficient peaks at heavy fermion values near 60% Sn. Los Alamos National Laboratory...
The UX3 systems with X = Ga, In, Tl, Si, Ge, Sn and Pb are a particularly interesting class of uranium compounds because both their magnetic and electronic properties are drastically influenced by f-spd hybridization. We report resistivity, low temperature specific heat, magnetic susceptibility and high field magnetization results for the U(In1−xSn...
The magnetic to nonmagnetic transition in actinide alloys and intermetallic compounds is attributable to the delocalization of the 5f electrons due to an increase in the f-f overlap and/or f-spd hybridization. USnâ is paramagnetic at all temperatures and appears to be very near the border between magnetic and nonmagnetic behavior. In contrast, UPbâ...
It has been established that the magnetic character of U alloys and intermetallic compounds is strongly correlated with the average U–U separation. The electrical resistivity, superconducting transition temperature, and room‐temperature lattice parameter have been measured for La 1-x U x Sn 3 to examine manifestations of a changing U–U separation o...
Citations
... Other examples of the formation and/ or destruction of heavy-electron states by variations of the chemical composition have been reported by Lin and co-workers (Lin et al. 1986) for U(In,-,Sn,), and by Sampathkumaran and Vijayaraghavan (1986) for CeCu2-,Ni,Si2, but in both cases the difficulty of the inherent disorder makes these examples less suitable for the investigations we tried to promote above. ...
... 6 A modified Curie-Weiss law, i.e. χ(T ) = χ 0 + C/(T + T * ), associates T * with T sf for relatively strong c-f hybridization. 10,11 Ultrafast time-resolved pump-probe spectroscopy has been recognized as a powerful technique to study the nonequilibrium carrier dynamics in strongly correlated electron materials. In addition to distinguishing different phases in a material by their different relaxation dynamics, it can discern whether one phase coexists or competes with another phase in close proximity, 12,13 giving information on the nature of low energy electronic structure of correlated electron systems, for example, in hightemperature superconductors. ...
... Meanwhile, there are only a few studies on the electronic structure of UIn 3 . Sarma et al. conducted a resonant photoemission study of U(Sn,In) 3 and found that the spectral profiles of the U 5f contributions do not show any significant changes within the series [21]. In a dHvA study of UIn 3 , several branches originating from closed Fermi surfaces and multiply-connected Fermi surfaces were observed [22]. ...
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