The essential role of magnetic frustration in the phase diagrams of doped cobaltites

Date
2021
Authors
Orth, Peter
Phelan, Daniel
Zhao, J.
Zheng, H.
Mitchell, J.F.
Leighton, C.
Fernandes, Rafael M.
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arXiv
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Orth, Peter
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Physics and Astronomy
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Ames Laboratory
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Physics and AstronomyAmes Laboratory
Abstract
Doped perovskite cobaltites (e.g., La1􀀀xSrxCoO3) have been extensively studied for their spin-state physics, electronic inhomogeneity, and insulator-metal transitions. Ferromagneticallyinteracting spin-state polarons emerge at low x in the phase diagram of these compounds, eventually yielding long-range ferromagnetism. The onset of long-range ferromagnetism (x ≈ 0.18) is substantially delayed relative to polaron percolation (x ≈ 0.05), however, generating a troubling inconsistency. Here, Monte-Carlo simulations of a disordered classical spin model are used to establish that previously ignored magnetic frustration is responsible for this e ect, enabling faithful reproduction of the magnetic phase diagram.
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This is a pre-print of the article Orth, Peter P., Daniel Phelan, J. Zhao, H. Zheng, J. F. Mitchell, C. Leighton, and Rafael M. Fernandes. "The essential role of magnetic frustration in the phase diagrams of doped cobaltites." arXiv preprint arXiv:2105.06402 (2021). DOI: 10.48550/arXiv.2105.06402. Copyright 2022 The Authors. Posted with permission.
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