Nature of the low-temperature anomalies in the physical properties of the intermediate-valent compound SmB6 |
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Authors: | N E Sluchanko A A Volkov V V Glushkov B P Gorshunov S V Demishev M V Kondrin A A Pronin N A Samarin Y Bruynseraede V V Moshchalkov S Kunii |
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Institution: | (1) General Physics Institute, Russian Academy of Sciences, 117942 Moscow, Russia;(2) Laboratorium voor Vaste-Stoffysika en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;(3) Department of Physics, Tohoku University, Sendai 980-77, Japan |
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Abstract: | The transport properties (Hall coefficient, thermopower, and resistivity) of high-quality single-crystal samples of the classical
mixed-valent compound SmB6 are investigated over a broad temperature range (1.6–300 K) in magnetic fields up to 45 T for the first time following the
quasioptical measurements in the 0.6–4.5 meV frequency range B. Gorshunov, N. Sluchanko, A. Volkov et al., submitted to Phys. Rev. B (1998)]. Measurements in the intrinsic conduction region permit determination of the gap width
E
g
≈20 meV and evaluation of the behavior of the mobility and concentration of light and heavy charge carriers, as well as the
temperature dependence of the carrier relaxation time, in samarium hexaboride. The results of experimental investigations
in the “impurity” conduction region (E
ex≈3.5 meV) are discussed within the Kikoin-Mishchenko exciton-polaron model of charge fluctuations. Arguments supporting the
formation of a metallic state with an electron-hole liquid in SmB6 at liquid-helium temperatures are presented.
Zh. éksp. Teor. Fiz. 115, 970–978 (March 1999) |
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