VALENCE CHANGE AND PHYSICAL-PROPERTIES IN SEMICONDUCTING MIXED-VALENT RARE-EARTH COMPOUNDS

被引:15
作者
KASAYA, M
KATOH, K
KOHGI, M
OSAKABE, T
SATO, N
机构
[1] Department of Physics, Faculty of Science, Tohoku University, Sendai
来源
PHYSICA B | 1994年 / 199卷
关键词
D O I
10.1016/0921-4526(94)91896-1
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Ce3Pt3Sb4 is a mixed-valent rare-earth semiconductor, the ground state properties of which can be explained by the band theory based on an itinerant electron model for the 4f electrons. On the other hand, the isostructural compound Ce3Au3Sb4 is also a semiconductor with a resistivity of 22 OMEGA cm at 0.13 K, but magnetic susceptibility and inelastic neutron scattering show that 4f electrons are well defined to be localized 4f1 state. In the latter, no clear anomaly in the thermomagnetic curve down to 0.5 K has been observed. However, there exists a broad peak at 1.5 K in the specific heat (C/T approximately 2500 mJ/mole K2) and the peak, which is symmetrical against log T, shifts towards the higher temperature side under the influence of a magnetic field. In this sense, Ce3Au3Sb4 is a good candidate for the study of the Kondo effect in an insulator.
引用
收藏
页码:534 / 538
页数:5
相关论文
共 14 条
[1]   HYBRIDIZATION GAP IN CE3BI4PT3 [J].
HUNDLEY, MF ;
CANFIELD, PC ;
THOMPSON, JD ;
FISK, Z ;
LAWRENCE, JM .
PHYSICAL REVIEW B, 1990, 42 (10) :6842-6845
[2]   SEMICONDUCTING PROPERTIES OF THE ISOMORPHOUS COMPOUNDS, CE3AU3SB4 AND CE3PT3SB4 [J].
KASAYA, M ;
KATOH, K ;
TAKEGAHARA, K .
SOLID STATE COMMUNICATIONS, 1991, 78 (09) :797-800
[3]   LOCALIZED F-ELECTRON ANTIFERROMAGNETISM, HEAVY-FERMION BEHAVIOR AND MIXED-VALENCE IN CE3AU3SB4, CE3PT3SB4 AND RELATED-COMPOUNDS [J].
KATOH, K ;
KASAYA, M .
PHYSICA B-CONDENSED MATTER, 1993, 186-88 :428-430
[4]  
KIMURA S, UNPUB J PHYS SOC JAP
[5]   THERMODYNAMICS OF THE KONDO MODEL [J].
RAJAN, VT ;
LOWENSTEIN, JH .
PHYSICAL REVIEW LETTERS, 1982, 49 (07) :497-500
[6]   MAGNETIC-SUSCEPTIBILITY AND SPECIFIC-HEAT OF THE COQBLIN-SCHRIEFFER MODEL [J].
RAJAN, VT .
PHYSICAL REVIEW LETTERS, 1983, 51 (04) :308-311
[7]   1/N AND QUANTUM MONTE-CARLO STUDIES OF A MAGNETIC IMPURITY IN AN INSULATOR WITH A SMALL GAP [J].
SASO, T .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1992, 61 (10) :3439-3442
[8]   IMPURITY BANDS IN KONDO INSULATORS [J].
SCHLOTTMANN, P .
PHYSICAL REVIEW B, 1992, 46 (02) :998-1004
[9]   THE KONDO PROBLEM .1. TRANSFORMATION OF THE MODEL AND ITS RENORMALIZATION [J].
SCHLOTTMANN, P .
PHYSICAL REVIEW B, 1982, 25 (07) :4815-4827
[10]   GAP IN THE MAGNETIC EXCITATION SPECTRUM OF CE3BI4PT3 [J].
SEVERING, A ;
THOMPSON, JD ;
CANFIELD, PC ;
FISK, Z ;
RISEBOROUGH, P .
PHYSICAL REVIEW B, 1991, 44 (13) :6832-6837