Correlating interfacial octahedral rotations with magnetism in (LaMnO 3+δ)N/(SrTiO3)N superlattices

Xiaofang Zhai, Long Cheng, Yang Liu, Christian M. Schlepütz, Shuai Dong, Hui Li, Xiaoqiang Zhang, Shengqi Chu, Lirong Zheng, Jing Zhang, Aidi Zhao, Hawoong Hong, Anand Bhattacharya, James N. Eckstein, Changgan Zeng

Research output: Contribution to journalArticlepeer-review

Abstract

Lattice distortion due to oxygen octahedral rotations have a significant role in mediating the magnetism in oxides, and recently attracts a lot of interests in the study of complex oxides interface. However, the direct experimental evidence for the interrelation between octahedral rotation and magnetism at interface is scarce. Here we demonstrate that interfacial octahedral rotation are closely linked to the strongly modified ferromagnetism in (LaMnO3+δ)N/SrTiO3)N superlattices. The maximized ferromagnetic moment in the N=6 superlattice is accompanied by a metastable structure (space group Imcm) featuring minimal octahedral rotations (a-a-c-, α∼4.2°, γ∼0.5°). Quenched ferromagnetism for N<4 superlattices is correlated to a substantially enhanced c axis octahedral rotation (a-a-c-, α∼3.8°, γ∼8° for N=2). Monte-Carlo simulation based on double-exchange model qualitatively reproduces the experimental observation, confirming the correlation between octahedral rotation and magnetism. Our study demonstrates that engineering superlattices with controllable interfacial structures can be a feasible new route in realizing functional magnetic materials.

Original languageEnglish (US)
Article number4283
JournalNature communications
Volume5
DOIs
StatePublished - Jul 9 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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