Electronic and crystal structure of α- and β-CeIr2Si2

被引：18
|
作者：
Mihalik, M. [1 ]
Divis, M. [1 ]
Sechovsky, V. [1 ]
机构：
[1] Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, CR-12116 Prague 2, Czech Republic
来源：
PHYSICA B-CONDENSED MATTER | 2009年 / 404卷 / 19期
关键词：
REr2Si2; Magnetization; Specific heat; Non-Fermi-liquid behavior; QUANTUM CRITICAL-POINT; FERMI-LIQUID BEHAVIOR; MAGNETIC-PROPERTIES;
D O I：
10.1016/j.physb.2009.07.052
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present the results of XRD, magnetization, resistivity and specific heat measurements of CeIr2Si2 single crystals for both, the low-temperature alpha-phase and the high-temperature beta-phase. respectively. The alpha-phase adopts the tetragonal ThCr2Si2-type whereas the beta-phase forms in the CaBe2Ge2-type structure. Both the phases remain paramagnetic down to low temperatures, nevertheless both, the magnetization and resistivity exhibit pronounced anisotropy in the whole temperature range of measurements (2-300K). Results of fitting the temperature dependence of the susceptibility within the interconfiguration-fluctuation model point to the Ce valence fluctuating between 3+ and 4+. The alpha-phase behaves as a Fermi-liquid (FL) at low temperatures whereas the beta-phase exhibits non-Fermi-liquid (NFL) features. The results are discussed in context of other similar polymorphic compounds. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：3191 / 3194
页数：4
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