Antiferromagnetic Kondo lattice to intermediate valence transition in Ce(Au1-xNix)2Si2 (0 ≤ x ≤ 1)

被引：2

作者：

Tchokonte, Moise Bertin Tchoula ^{[1
]}

du Plessis, Paul de Villiers ^{[2
,3
]}

Strydom, Andre Michael ^{[3
]}

Doyle, Terry Brian ^{[4
]}

Ghosh, Sarit ^{[3
]}

Kaczorowski, Dariusz ^{[5
]}

机构：

[1] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa

[2] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

[3] Univ Johannesburg, Dept Phys, Highly Correlated Matter Res Grp, ZA-2006 Auckland Pk, South Africa

[4] iThemba LABS, Mat Res Grp, ZA-7129 Somerset West, South Africa

[5] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2015年 / 77卷

基金：

新加坡国家研究基金会;

关键词：

HEAVY-FERMION BEHAVIOR; MAGNETIC-PROPERTIES; SINGLE-CRYSTAL; 4F-LIGAND DEHYBRIDIZATION; TRANSPORT-PROPERTIES; DENSE KONDO; CE; CEAU2SI2; SYSTEMS; SERIES;

D O I：

10.1016/j.jpcs.2014.09.014

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Transition effects from magnetically ordered Kondo lattice (KL) behaviour in CeAu2Si2 to intermediate valence (IV) behaviour in CeNi2Si2 have been investigated by substitution of Au with Ni. These investigations were done through measurements of the lattice parameters, electrical resistivity (rho(T)), magnetisation (M(mu H-0)) and magnetic susceptibility (chi(T)) on the Ce(Au1-xNix)(2)Si-2 (0 <= x <= 1) series. Lattice parameters as derived from XRD measurements deviate from Vegard's rule around x = 0.6-0.8. rho(T) data indicate KL behaviour in the presence of a crystal field for x <= 0.6, the occurrence of magnetic ordering for x <= 0.2 and valence fluctuation for x >= 0.8. chi(T) data at high temperatures, follow the Curie-Weiss relation for alloys in the concentration 0 <= x <= 0.6 (KL region) and give effective magnetic moment values mu(eff) close to that expected for free Ce3+ ion. The low temperature chi(T) data indicate the onset of antiferromagnetic ordering for x <= 0.2. For alloys in the concentration range 0.8 <= x <= 1, the chi(T) behaviour is reminiscent of intermediate valence (IV) systems. M(mu H-0) measurements indicate metamagnetic behaviour for alloys in the concentration range 0 <= x <= 0.1. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：56 / 61

页数：6

共 42 条

[1] STRUCTURAL MAGNETIC AND TRANSPORT-PROPERTIES OF A NEW VALENCE FLUCTUATING COMPOUND - CERHSI2 [J].