Abstract
The semimetallic quasi-one-dimensional S = 1/2 antiferromagnet Yb4As3 has been studied by performing low-temperature (T) and high magnetic-field (B) measurements of the specific heat, C(T,B), magnetization, M(T,B), AC-susceptibility, χAC(T,B), and electrical resistivity, ρ(T,B). At finite transverse magnetic fields, a gap Δ(B) is induced in the low-energy magnetic excitation spectrum. Our C(T,B) measurements reveal a Δ(B)∼B2/3 dependence for B≤9 T, in accordance with predictions of the quantum sine-Gordon model. At higher fields the Δ(B) curve levels-off gradually. In the isothermal magnetization taken at 0.6 K no saturation occurs up to 60 T. We also present new results on spin-glass behavior below 0.15 K caused by a weak ferromagnetic interchain coupling and disorder. Finally, we concentrate on the electrical transport properties. Shubnikov-de Haas oscillations, arising from a low-density system of mobile As-4p holes, are recorded in magnetic fields up to 60 T. We estimate the effective mass and the mean-free path of these carriers and discuss spin-splitting effects.
Original language | English |
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Pages (from-to) | 315-320 |
Number of pages | 6 |
Journal | Physica B: Condensed Matter |
Volume | 312-313 |
DOIs | |
Publication status | Published - 2002 Mar |
Externally published | Yes |
Event | International Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States Duration: 2002 Aug 6 → 2002 Aug 6 |
Keywords
- One-dimensional Heisenberg chain
- Shubnikov-de Haas effect
- Spin glass
- YbAs
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering