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      https://www.ias.ac.in/article/fulltext/pram/058/05-06/0715-0723

    • Keywords

       

      S=1/2 antiferromagnet Yb4As3; magnetotransport; isothermal resistivity; heavy fermion; Shubnikov-de Haas oscillations

    • Abstract

       

      The transport properties of the semimetallic quasi-one-dimensional S=1/2 antiferromagnet Yb4As3 have been studied by performing low-temperature (T≥0.02 K) and high magneticfield (B≤60 T) measurements of the electrical resistivity ρ(T, B). For T ≿ 2 K a ‘heavy-fermion’-like behavior Δρ(T)=AT2 with huge and nearly field-independent coefficient A ≈ 3 µΩ cm/K2 is observed, whereas at lower temperatures ρ(T) deviates from this behavior and slightly increases to the lowest T. In B>0 and T ≾ 6 K the resistivity shows an anomalous magnetic-history dependence together with an unusual relaxation behavior. In the isothermal resistivity Shubnikov-de Haas (SdH) oscillations, arising from a low-density system of mobile As-4p 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±0.005)m0 and a charge-carrier mean-free path of 215 Å are determined. Furthermore, in B≥15 T, the system is near the quantum limit and spin-splitting effects are observed.

    • Author Affiliations

       

      P Gegenwart1 H Aoki1 T Cichorek1 J Custers1 M Jaime2 A Ochiai3 F Steglich1

      1. Max-Planck Institute for Chemical Physics of Solids, Dresden - D-01187, Germany
      2. Los Alamos National Laboratory, Los Alamos, New Mexico - 87545, USA
      3. Center for Low Temperature Science, Tohoku University, Sendai - 980-8578, Japan
    • Dates

       
  • Pramana – Journal of Physics | News

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