Signatures of enhanced ordering temperatures in digital superlattices of (LaMnO3)m/(SrMnO3)2m

被引：47

作者：

Bhattacharya, A.

Zhai, X.

Warusawithana, M.

Eckstein, J. N.

Bader, S. D.

机构：

[1] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA

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

[3] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 22期

关键词：

D O I：

10.1063/1.2745205

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Digital superlattices of (LaMnO3)(m)/SrMnO3)(2m) (m <= 3) having the same nominal composition as La1/3Sr2/3MnO3, an antiferromagnetic insulator, have been synthesized by means of molecular beam epitaxy. All superlattices show a sharp resistive maximum at temperatures near to or higher than the Neel temperature of bulk La1/3Sr2/3MnO3. No discernible signatures of magnetic ordering are observed near the resistivity peak for m <= 2, but m=3 has a susceptibility peak consistent with antiferromagnet ordering, which is canted when cooled in a small magnetic field. Analogies are drawn to d(x)(2)-y(2) orbitally ordered, layered antiferromagnetic manganites to explain the observations. (C) 2007 American Institute of Physics.

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