Interrelation between orbital polarization and magnetic structure in bilayer manganites

被引：29

作者：

Akimoto, T ^{[1
]}

Moritomo, Y

Ohoyama, K

Okamoto, S

Ishihara, S

Maekawa, S

Nakamura, A

机构：

[1] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, CIRSE, Nagoya, Aichi 4648601, Japan

[3] JST, PRESTO, Chiyoda Ku, Tokyo 102, Japan

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Nagoya Univ, CIRSE, Nagoya, Aichi 4648601, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.59.R14153

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A-site substitution effects on the magnetic and lattice structure have been investigated for bilayer manganites, (La1-zNdz)(1.2)(Sr1-yCay)(1.8)Mn2O7, without changing the e(g)-electron concentration (x = 0.4). The ferromagnetic metallic (FM) phase of the parent La1.2Sr1.8Mn2O7 (T-C= 120 K) is suppressed by Nd doping (z), and a paramagnetic insulating (PI) state appears above z = 0.3. The FM phase is suppressed also by Ca doping (y), but a layered-type antiferromagnetic (A-AF) structure appears above y = 0.3. We have investigated the stability of the d(x2-y2) (or d(3Z2-r2)) orbital by Madelung potential calculation based on the structural data, and have found that orbital polarization governs the magnetic structure in bilayer manganites.

引用

页码：14153 / 14156

页数：4

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