Magnetotransport of the low-carrier density one dimensional S=1/2 antiferromagnet Yb₄A5₃.
- Marcello
The transport properties of the semimetallic quasi-onedimensional S= 1/2 antiferromagnet Yb,As, have been studied by performing low-temperature (T 2 0.02 K) and high magnetic field (B I 60 T) measurements of the electrical resistivity p(T,B). For T 2 2 K a 'heavy fermion' like behavior AAT = AT' with huge and nearly field-independent coefficient A 3 3UuRcmK' is observed, whereas at lower temperatures p(r) deviates from this behavior and slightly increases to the lowest T. In B 0 and T L 6 K the resistivity shows an anomalous magnetic-history dependence together with an unusual relaxation behavior. In tht isothermal resistivity Shubnikov-de Haas oscillations, arising fiom a low-density system of mobile As-+ holes, with a frequency of 25 T have been recorded. From the T- and B-dependence of the SdH oscillations an effective carrier mass of (0.275 f 0.O05)ni0 and a charge-camtr mean-free path of 2 15 A are determined. Furthermore in B 2 15 T the system is near the quantum limit and spin-splitting effects are observed.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 975879
- Report Number(s):
- LA-UR-01-6492; TRN: US201018%%965
- Resource Relation:
- Conference: Submitted to: International Symposium on Advances in Superconductivity and Magnetism, September 25-28, Mangalone, India
- Country of Publication:
- United States
- Language:
- English
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