Calorimetric Study in Single Crystalline RCu2Si2 (R: Rare Earth)

被引：24

作者：

Takeda, Yuji ^{[1
]}

Dung, Nguyen Duc ^{[1
,2
]}

Nakano, Yasunori ^{[1
]}

Ishikura, Tatsurou ^{[1
]}

Ikeda, Shugo ^{[2
]}

Matsuda, Tatsuma D. ^{[2
]}

Yamamoto, Etsuji ^{[2
]}

Haga, Yoshinori ^{[2
]}

Takeuchi, Tetsuya ^{[3
]}

Settai, Rikio ^{[1
]}

Onuki, Yoshichika ^{[1
,2
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Osaka 5600043, Japan

[2] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[3] Osaka Univ, Low Temp Ctr, Osaka 5600043, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 10期

关键词：

RCu2Si2; single crystals; specific heat; crystalline electric field; nuclear specific heat;

D O I：

10.1143/JPSJ.77.104710

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Specific heat measurements on a series of ternary compound RCu2Si2 (R: La, Pr, Nd, Sin, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) single crystals have been performed by the quasi-adiabatic heat Pulse method in the wide temperature range from 0.1 to 80 K. Almost all the compounds show antiferromagnetic orderings at low temperatures. We found the first-order like very sharp specific heat peaks in RCu2Si2 with R = Gd, Tb, Dy, Ho, and Er. Especially, the antiferromagnetic ordering in DyCu2Si2 is found to be a first-order transition. Front the analyses of the temperature dependence of magnetic entropy, we confirmed that the total splitting energy of the crystalline electric field (CEF) scheme of R3+ ion in RCu2Si2 is about 100 K in all the compounds studied here, except for YbCu2Si2. In addition, we observed the nuclear specific heat at low temperatures and estimated the magnitude of internal effective magnetic field H-eff at the nucleus.

引用

页数：12

共 40 条

[1] MAGNETIC ORDER IN THE TERNARY COMPOUND TMCU2SI2 [J].