Ca0.85Sm0.15MnO3:: A mixed antiferromagnet with unusual properties

被引：63

作者：

Mahendiran, R ^{[1
]}

Maignan, A ^{[1
]}

Martin, C ^{[1
]}

Hervieu, M ^{[1
]}

Raveau, B ^{[1
]}

机构：

[1] Univ Caen, ISMRA, Lab CRIMAT, F-14050 Caen, France

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.62.11644

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We establish a phase diagram for the electron-doped manganites Ca1-xSmxMnO3 (0 less than or equal tox less than or equal to0.15). The low-temperature insulating phase of x=0.15 is a mixed antiferromagnet with two long-range antiferromagnets, C-type (monoclinic) and G-type (orthorhombic), coexisting with short-range ferromagnetic clusters (orthorhombic). Resistivity (rho) and magnetization (M) of x= 0.15 show unusual magnetic-field history-dependent phenomena which are not observed for x less than or equal to0.12: irreversibilty between zero-field-cooled (ZFC) and field-cooled (FC) data below 120 K and hysteresis between cooling and warming for all values of magnetic fields (0 less than or equal toH less than or equal to 7T). Field cooling strongly enhances M (M-FC/M-ZFC=2.7 at H=5 T and 10 K) reduces rho (rho (FC)/rho (ZFC) = 5x10(-4) at 7 T and 10 K) and even induces metalliclike resistivity (d rho /dT>0) for H=7 T below 80 K. We discuss the possible origins of the results.

引用

页码：11644 / 11648

页数：5

共 27 条

[1] First order nucleation of charge ordered domains in La0.5Ca0.5MnO3 detected by 139La and 55Mn NMR [J].