Nanomagnetic droplets and implications to orbital ordering in La1-xSrxCoO3 -: art. no. 027201

被引：142

作者：

Phelan, D

Louca, D ^{[1
]}

Rosenkranz, S

Lee, SH

Qiu, Y

Chupas, PJ

Osborn, R

Zheng, H

Mitchell, JF

Copley, JRD

Sarrao, JL

Moritomo, Y

机构：

[1] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

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

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[6] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.96.027201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inelastic cold-neutron scattering on LaCoO3 provided evidence for a distinct low energy excitation at 0.6 meV coincident with the thermally induced magnetic transition. Coexisting strong ferromagnetic (FM) and weaker antiferromagnetic correlations that are dynamic follow the activation to the excited state, identified as the intermediate S=1 spin triplet. This is indicative of dynamical orbital ordering favoring the observed magnetic interactions. With hole doping as in La1-xSrxCoO3, the FM correlations between Co spins become static and isotropically distributed due to the formation of FM droplets. The correlation length and condensation temperature of these droplets increase rapidly with metallicity due to the double exchange mechanism.

引用

页数：4

共 26 条

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