New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3

被引：32
|
作者：
Helfrich, R [1 ]
Koppen, M
Lang, M
Steglich, F
Ochiai, A
机构：
[1] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany
[2] TU Darmstadt, Inst Festkorperphys, D-64289 Darmstadt, Germany
[3] Niigata Univ, Dept Mat Sci & Technol, Niigata 95021, Japan
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷
关键词：
heavy fermions; low-carrier-density system; Heisenberg chain; Gruneisen parameter; rare earth pnictides;
D O I：
10.1016/S0304-8853(97)00691-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb4As3 as well as Yb-4(As1-yXy)(3), X: P, Sb. We infer that Yb4As3 behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb3+ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Gruneisen parameter shows rather anomalous temperature and field dependences. (C) 1998 Elsevier Science B.V. All rights reserved.
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页码：309 / 310
页数：2
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