Magnetotransport of the low-carrier density one-dimensional 𝑆=1/2 antiferromagnet Yb4As3

Pramana

T Cichorek²  P Gegenwart²  F Steglich1²  A Ochiai³  H Aoki²  J Custers²  M Jaime¹ 

[1] Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA$$;Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany$$;Center for Low Temperature Science, Tohoku University, Sendai 980-8578, Japan$$

关键词: 𝑆 = 1/2 antiferromagnet Yb4As3;    magnetotransport;    isothermal resistivity;    heavy fermion;    Shubnikov–de Haas oscillations.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 magnetic-field (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.

【 授权许可】

Unknown