Specific heat of (Sr-Ca)RuO3

被引：69

作者：

Kiyama, T ^{[1
]}

Yoshimura, K

Kosuge, K

Michor, H

Hilscher, G

机构：

[1] Kyoto Univ, Grad Sch Sci, Div Chem, Kyoto 60601, Japan

[2] Vienna Univ Technol, Inst Expt Phys, A-1040 Vienna, Austria

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 01期

关键词：

SrRuO3; CaRuO3; itinerant electron magnetism; weakly ferromagnetic metal; nearly ferromagnetic metal;

D O I：

10.1143/JPSJ.67.307

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat of (Sr-Ca)RuO3 system was measured by an adiabatic method utilizing a heat-pulse technique. The values of electronic specific heat coefficient gamma change from 30 mJ/molK(2) for SrRuO3 to 82 mJ/molK(2) for CaRuO3 through a maximum value of about 100 mJ/molK(2) for Sr0.2Ca0.8RuO3. A strong upturn in the C/T vs T-2 curve at low temperatures has been observed for paramagnetic Sr0.2Ca0.8RuO3 and CaRuO3. This behavior is quantitatively explained by the spin-fluctuation theory of the itinerant-electron magnetism. suggesting that this system possibly changes from intermediate itineract ferromagnet of SrRuO3, through weakly itinerant ferromagnet, to nearly ferromagnetic metal of CaRuO3.

引用

页码：307 / 311

页数：5

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