Thermal properties of metamagnetic transition in heavy-fermion systems

被引：83

作者：

Aoki, Y

Matsuda, TD

Sugawara, H

Sato, H

Ohkuni, H

Settai, R

Onuki, Y

Yamamoto, E

Haga, Y

Andreev, AV

Sechovsky, V

Havela, L

Ikeda, H

Miyake, K

机构：

[1] Tokyo Metropolitan Univ, Fac Sci, Dept Phys, Tokyo 19203, Japan

[2] Osaka Univ, Fac Sci, Osaka 560, Japan

[3] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 31911, Japan

[4] Acad Sci Czech Republic, Inst Phys, CZ-18040 Prague 8, Czech Republic

[5] Charles Univ Prague, Dept Met Phys, CR-12116 Prague 2, Czech Republic

[6] Natl Inst Adv Interdisciplinary Res, JRCAT, Tsukuba, Ibaraki 305, Japan

[7] Osaka Univ, Fac Engn, Osaka 560, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷

关键词：

heavy-fermion systems; metamagnetism; specific heat - low temperature; magnetocaloric effect;

D O I：

10.1016/S0304-8853(97)00484-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to investigate the metamagnetic anomaly (MA) observed in several heavy-fermion compounds, field dependence of specific heat C(B) and magnetocaloric effect have been measured in the prototypical 4f-electron compound CeRu(2)Si(2), and compared to that of a 5f-electron metamagnet UCoAl. In the C/T versus B curves, an unexpected double-peak structure is found in CeRu(2)Si(2), suggesting that MA is closely related to a sharp peak in the density of states of the hybridized quasiparticle bands. On the other hand, for UCoAl, only a small decrease in C/T is observed, although both compounds exhibit similar bulk magnetic properties. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：271 / 276

页数：6

共 29 条

[1] TRANSITION OF F-ELECTRON NATURE FROM ITINERANT TO LOCALIZED - METAMAGNETIC TRANSITION IN CERU2SI2 STUDIED VIA THE DE-HAAS-VAN-ALPHEN EFFECT [J].