Calorimetric and magnetic investigations of the metamagnet Pr0.5Ca0.5Mn0.95Ga0.05O3 -: art. no. 024401

被引：62

作者：

Hardy, V ^{[1
]}

Maignan, A ^{[1
]}

Hébert, S ^{[1
]}

Martin, C ^{[1
]}

机构：

[1] Univ Caen, Inst Sci Mat & Rayonnement, Unite Mixte Rech 6508, Lab CRISMAT, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.67.024401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The antiferromagnetic, charge and orbitally ordered (AFCOO) ground state of some manganites like Pr0.5Ca0.5MnO3 can be efficiently destabilized by slight Mn-site substitutions. Such a weakened AFCOO state and related disorder effects were investigated in Pr0.5Ca0.5Mn0.95Ga0.05O3 by combining specific-heat and magnetization measurements. The study was extended to the ferromagnetic state which can be installed in this compound by field application at low T. Under a large field, the temperature-driven collapse of this ferromagnetic state was found to be consistent with the Clausius-Clapeyron relation typical of first-order transitions. A comparative study of the various magnetoelectronic states encountered in the substituted and unsubstituted compounds was also carried out by investigating the low-temperature dependence of specific heat.

引用

页数：7