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
收藏
页码：14153 / 14156
页数：4
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