Random potential effect near the bicritical region in perovskite manganites as revealed by comparison with the ordered perovskite analogs

被引：234

作者：

Akahoshi, D ^{[1
]}

Uchida, M

Tomioka, Y

Arima, T

Matsui, Y

Tokura, Y

机构：

[1] AIST, CERC, Tsukuba, Ibaraki 3058562, Japan

[2] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[3] Univ Tsukuba, Inst Sci Mat, Tsukuba, Ibaraki 3058573, Japan

[4] AIST, JST, ERATO, Spin Superstruct Project, Tsukuba, Ibaraki 3058562, Japan

[5] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.90.177203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The orbital-charge-spin ordering phase diagram for half-doped perovskites Ln(1/2)Ba(1/2)MnO(3) (Ln = rare earth) with ordered Ln/Ba cations has been investigated comparatively with that of the Ln/Ba solid-solution analogs. A large modification of the phase diagram is observed upon the A-site disordering near the original bicritical point between the charge-orbital ordering and ferromagnetic metallic phases. The random potential by quenched disorder inherent in the A-site solid solution is found to suppress the respective long-range orders and gives rise to the colossal magnetoresistive state.

引用

页码：4 / 177203

页数：4

共 23 条

[1]

AKAHOSHI D, UNPUB

[2] Change in charge and orbital alignment upon antiferromagnetic transition in the A-site-ordered perovskite manganese oxide RBaMn2O6 (R=Tb and Sm) -: art. no. 140408 [J].