Specific heat of mixed-valence intermetallic system Yb1-xCexInCu4

被引：2
|
作者：
Voloshok, T. [1 ]
Kadyrova, E.
Mushnikov, N.
Vasiliev, A.
机构：
[1] Moscow MV Lomonosov State Univ, Fac Phys, Low Temp Phys & Superconductiv Dept, Moscow 119992, Russia
[2] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620041, Russia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期
关键词：
YbInCu4; valence fluctuation; specific heat;
D O I：
10.1016/j.jmmm.2007.02.169
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The YbInCu4 exhibits a first-order phase transition associated with a transformation of the valence state of the Yb ion. The effect of alloying on the valence transition in Yb1-xCexInCu4 ( 0 <= x <= 0.2) has been investigated by specific heat C measurements in the range 5-300 K. The C vs. T dependence in YbInCu4 reveals sharp peak at TV 39 K. This peak shifts to higher temperatures with x and its shape gradually transforms to that of continuous phase transition. The specific heat measurements have also been made for nonmagnetic isomorphous compound YInCu. The comparison of YInCu4 data with those of Yb1-xCexInCu4 allows an estimate of the value of entropy Delta S released at the phase transition. The Sommerfeld coefficient values in the Yb1-xCexInCu4 family of compounds were found increasing with Ce concentration. (c) 2007 Elsevier B. V. All rights reserved.
引用
收藏
页码：E428 / E430
页数：3
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