Essential role of magnetic frustration in the phase diagrams of doped cobaltites

Peter Orth, D. Phelan, J. Zhao, H. Zheng, J. F. Mitchell, C. Leighton, Rafael M Fernandes

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Doped perovskite cobaltites (e.g., La1-xSrxCoO3) have been extensively studied for their spin-state physics, electronic inhomogeneity, and insulator-metal transitions. Ferromagnetically interacting 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 effect, enabling faithful reproduction of the magnetic phase diagram.

Original languageEnglish (US)
Article numberL071402
JournalPhysical Review Materials
Issue number7
StatePublished - Jul 2022

Bibliographical note

Funding Information:
Acknowledgments. We acknowledge valuable discussions with B. I. Shklovskii and T. Vojta. Experimental work at the University of Minnesota (UMN) was supported by the U.S. Department of Energy through the UMN Center for Quantum Materials under DE-SC-0016371. Work at Argonne National Laboratory (crystal growth and magnetic characterization) was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. During conception and execution of the theory work, R.M.F. and P.P.O. were supported by the National Science Foundation through the UMN MRSEC under Grant No. DMR-1420013, renewed as DMR-2011401. P.P.O also acknowledges support from startup funds from Iowa State University during the late stages of the theory work.

Publisher Copyright:
© 2022 American Physical Society.

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