Influence of quasi-bi-stripe charge order on resistivity and magnetism in the bilayer manganite La2-2xSr1+2xMn2O7

被引：36

作者：

Kubota, M

Oohara, Y

Yoshizawa, H

Fujioka, H

Shimizu, K

Hirota, K

Moritomo, Y

Endoh, Y

机构：

[1] Univ Tokyo, ISSP, Neutron Scattering Lab, Tokai, Ibaraki 3191106, Japan

[2] Tohoku Univ, Dept Phys, CREST, Aoba Ku, Sendai, Miyagi 9808578, Japan

[3] Tohoku Univ, Mat Res Inst, Aoba Ku, Sendai, Miyagi 9808577, Japan

[4] Nagoya Univ, Ctr Integrated Res Sci & Engn, Nagoya, Aichi 4648601, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 07期

关键词：

bilayer manganite La2-2xSr1+2xMn2O7; colossal magnetoresistance (CMR); charge ordering; stripe order; e(g) orbital; low-dimensionality;

D O I：

10.1143/JPSJ.69.1986

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Charge ordering in the bilayer manganite system La2-2xSr1+2xM2O7 with 0.30 less than or equal to x less than or equal to 0.50 is studied by neutron diffraction. The charge order is characterized by the propagation vector parallel to the [100] direction (MnO2 direction), but the correlation length is short-ranged and extremely anisotropic, being similar to 0.02a* and similar to 0.2a* parallel and perpendicular to the modulation direction, respectively. The observed charge order can be viewed as a quasi-bistripe order, and accounts well for the x dependence of the resistivity. The quasi-bistripe order is stable within the ferromagnetic (FM) MnO2 layers in the A-type antiferromagnetic order, but is destabilized by the three dimensional FM order.

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页码：1986 / 1989

页数：4

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