Magnetism in epitaxial PrCoO3 and Pr0.7Y0.3CoO3 thin films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:451

Article

Sanders, Ted D.^1,2  Alaan, Urusa S.^2,3  Gray, Matthew T.^2,3  Bose, Shameek⁴  Taylor, Matthew⁴  Cabero, Mariona^5,6  Mehta, Virat⁷  Varela, Maria^5,6  Leighton, Chris⁴  Suzuki, Yuri^1,2 

[1] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[2] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[4] Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA

[5] Univ Complutense Madrid, Inst Magnetismo Aplicado, Dept Fis Mat, Madrid, Spain

[6] Univ Complutense Madrid, Inst Pluridiscplinar, Madrid, Spain

[7] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA USA

关键词: Epitaxial oxide thin films;    Cobaltites;    Epitaxial strain;    Chemical pressure;   

DOI  :  10.1016/j.jmmm.2017.11.127

来源: Elsevier

【 摘 要 】

Lattice distortions can stabilize magnetic ground states not observed in the bulk for thin films of undoped cobalt perovskites ACoO(3). We have found that lattice distortions, in the form of tensile epitaxial strain, can stabilize a ferromagnetic ground state in PrCoO3 thin films below 65 K. However, in Pr0.7Y0.3CoO3, which has a smaller unit cell, similar levels of tensile strain are insufficient to induce ferromagnetism. These results indicate the importance of A-site cation choice for Co spin-state and Co-O-Co exchange interactions, offering another dimension to tune magnetic order in thin film cobalt perovskites. (C) 2017 Elsevier B.V. All rights reserved.

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