Spin dynamical properties of the layered perovskite La1.2Sr1.8Mn2O7

被引：33

作者：

Fujioka, H ^{[1
]}

Kubota, M

Hirota, K

Yoshizawa, H

Moritomo, Y

Endoh, Y

机构：

[1] Tohoku Univ, Dept Phys, CREST, Sendai, Miyagi 9808578, Japan

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

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

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1999年 / 60卷 / 8-9期

关键词：

magnetic materials; crystal growth; neutron scattering; spin-density waves;

D O I：

10.1016/S0022-3697(99)00071-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Inelastic neutron-scattering measurements were performed on a single crystal of the layered colossal magnetoresistance (CMR) material La1.2Sr1.8Mn2O7 (T-C similar to 120 K). We found that the spin wave dispersion is almost perfectly two-dimensional with the in-plane spin stiffness constant D similar to 151 meV Angstrom. The value is similar to that of similarly doped La1-xSrxMnO3 though its T-c is three times higher, indicating a large renormalization due to low dimensionality. There exist two branches due to a coupling between layers within a double-layer. The out-of-plane coupling is about 30% of the in-plane coupling though the Mn-O bond lengths are similar. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1165 / 1168

页数：4

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