Magnetic ordering and spin-state transition in R0.67Sr0.33CoO3 -: art. no. 224416

被引：44

作者：

Paraskevopoulos, M ^{[1
]}

Hemberger, J ^{[1
]}

Krimmel, A ^{[1
]}

Loidl, A ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys, D-86159 Augsburg, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.63.224416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of ceramic R0.67Sr0.33CoO3 samples with R = La, Pr, Pr0.5Nd0.5 Nd, Nd0.5Sm0.5 and Sm have been prepared. We report on detailed structural, electrical, magnetic, and thermodynamic studies. All samples reveal magnetic order, spanning the range from a ferromagnetic metal to a ferrimagnet close to a metal-to-insulator transition. We found a clear correlation between structural properties and resistivity as well as between structure and magnetic exchange interactions. In this context the importance of double exchange is discussed. Heat-capacity experiments show a significant anomaly at the magnetic transition temperature of the La compound only. The samples with magnetic rare-earth ions reveal significant Schottky anomalies at low temperatures and allow for a rough estimate of the crystal-field splittings.

引用

页数：7

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