LOW-TEMPERATURE SPECIFIC-HEAT OF NDMO3 (M=CO, FE, CR, NI) - MAGNETIC-ORDERING OF ND

被引：49

作者：

BARTOLOME, F ^{[1
]}

KUZMIN, MD ^{[1
]}

BARTOLOME, J ^{[1
]}

BLASCO, J ^{[1
]}

GARCIA, J ^{[1
]}

SAPINA, F ^{[1
]}

机构：

[1] UNIV VALENCIA,UIBCM,DEPT QUIM INORGAN,BURJASSOT,SPAIN

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 91卷 / 03期

关键词：

D O I：

10.1016/0038-1098(94)90218-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A low temperature (200 mK < T < 5 K) specific heat study of NdMO3 (M = Co, Fe, Cr, Ni) reveals that in NdCoO3 the Nd ions order cooperatively at T(N2) = 1.20(1) K in good agreement with the simple cubic S=1/2 XY model. In contrast, in NdFeO3, NdNiO3 and NdCrO3 a Schottky-type anomaly caused by the Nd-M interaction is the dominating feature of the specific heat curves, whereas the Nd ordering peak is greatly suppressed and shifted to lower temperatures in NdFeO3 and NdNiO3 (T(N2) = 1.05(1) and 0.77(2) K, respectively) and does not appear in the Cr compound. These phenomena depend critically on the strength of the Nd-M exchange field experienced by the Nd ions-zero in NdCoO3, intermediate in NdFeO3 and NdNiO3, and large in NdCrO3. Existence of two magnetically different Nd sites in NdNiO3 is demonstrated.

引用

页码：177 / 182

页数：6

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