Short-range spin correlations in the CMR material La1.4Sr1.6Mn2O7

被引：4

作者：

Kelley, TM

Argyriou, DN

Robinson, RA

Nakotte, H

Mitchell, JF

Osborn, R

Jorgensen, JD

机构：

[1] Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICA B | 1997年 / 241卷

关键词：

colossal magneto-resistance; (La1-xSrx)(3)Mn2O7; magnetic polarons;

D O I：

10.1016/S0921-4526(97)00613-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The (La1-xSrx)(2)Mn3O7 compounds are layered materials that exhibit higher magneto-resistance than the corresponding 3D manganite perovskites. Quasi-elastic neutron scattering on a polycrystalline sample of La1.4Sr1.6Mn2O7 shows that the spin-fluctuation spectrum of these layered CMR materials is qualitatively similar to those found in the perovskite manganites (La, Ca)MnO3; their concentration, lifetime, and coherence length increase as T decreases to T-c. Unlike the perovskites, we find a lower spin-diffusion constant above T-c of similar to 5 meV Angstrom(2). (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：439 / 441

页数：3

共 4 条

[1] Evidence for magnetic polarons in the magnetoresistive perovskites [J].