Thermodynamic and transport properties of the one-dimensional S=12 antiferromagnet Yb4As3
| Autor: | Hayuyoshi Aoki, J. Custers, Frank Steglich, Philipp Gegenwart, Nicholas M. Harrison, Tomasz Cichorek, Michael Lang, Marcelo Jaime, Akira Ochiai |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Spin glass Condensed matter physics Condensed Matter Physics Shubnikov–de Haas effect Electronic Optical and Magnetic Materials Magnetic field Magnetization Effective mass (solid-state physics) Electrical resistivity and conductivity Antiferromagnetism ddc:530 Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Saturation (magnetic) |
| Zdroj: | Physica B: Condensed Matter. :315-320 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(01)01526-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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