Evolution of magnetic phases and orbital occupation in (SrMnO3)n/(LaMnO3)2n superlattices

被引：58

作者：

Aruta, C. ^{[1
]}

Adamo, C. ^{[2
]}

Galdi, A. ^{[1
,3
]}

Orgiani, P. ^{[1
,4
]}

Bisogni, V. ^{[5
]}

Brookes, N. B. ^{[5
]}

Cezar, J. C. ^{[5
]}

Thakur, P. ^{[5
]}

Perroni, C. A. ^{[1
,6
]}

De Filippis, G. ^{[1
,6
]}

Cataudella, V. ^{[1
,6
]}

Schlom, D. G. ^{[2
]}

Maritato, L. ^{[1
,4
]}

Ghiringhelli, G. ^{[1
,7
]}

机构：

[1] Complesso Univ Monte St Angelo, CNR, INFM Coherentia, I-80126 Naples, Italy

[2] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[3] Univ Salerno, Dipartimento Sci Fisiche, I-84081 Baronissi, Salerno, Italy

[4] Univ Salerno, Dipartimento Matemat & Informat, I-84081 Baronissi, Salerno, Italy

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[6] Complesso Univ Monte St Angelo, Univ Naples Federico II, Dipartimento Sci Fisiche, I-80126 Naples, Italy

[7] Politecn Milan, Dipartmento Fis, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 14期

关键词：

THIN-FILMS; NEUTRON-DIFFRACTION; TRANSITION; DICHROISM; STRAIN;

D O I：

10.1103/PhysRevB.80.140405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic and electronic modifications induced at the interfaces in (SrMnO3)(n)/(LaMnO3)(2n) superlattices have been investigated by linear and circular magnetic dichroism in the Mn L-2,L-3 x-ray absorption spectra. Together with theoretical calculations, our data demonstrate that the charge redistribution across interfaces favors in-plane ferromagnetic (FM) order and e(g)(x(2)-y(2)) orbital occupation, in agreement with the average strain. Far from interfaces, inside LaMnO3, electron localization and local strain favor antiferromagnetism (AFM) and e(g)(3z(2)-r(2)) orbital occupation. For n=1 the high density of interfacial planes ultimately leads to dominant FM order forcing the residual AFM phase to be in-plane too, while for n >= 5 the FM layers are separated by AFM regions having out-of-plane spin orientation.

引用

页数：4

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