Magnetic frustration control through tunable stereochemically driven disorder in entropy-stabilized oxides

Peter B. Meisenheimer, Logan D. Williams, Suk Hyun Sung, Jiseok Gim, Padraic Shafer, George N. Kotsonis, Jon Paul Maria, Morgan Trassin, Robert Hovden, Emmanouil Kioupakis, John T. Heron

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Abstract

Entropy-stabilized oxides possess a large configurational entropy that allows for the unique ability to include typically immiscible concentrations of species in different configurations. Particularly in oxides, where the physical behavior is strongly correlated to stereochemistry and electronic structure, entropic stabilization creates a unique platform to tailor the interplay of extreme structural and chemical disorder to realize unprecedented functionalities. Here, we control stereochemically driven structural disorder in single crystalline, rocksalt, (MgCoNiCuZn)O-type entropy-stabilized oxides through the incorporation of Cu2+ cations. We harness the disorder to tune the degree of glassiness in the antiferromagnetic structure. Structural distortions driven by the Jahn-Teller effect lead to a difference in valence on the Co cation sites, which extends to dilution and disorder of the magnetic lattice. A spin glass model reveals that the fractional spin ordering of the magnetic lattice can be tuned by ∼65%. These findings demonstrate entropy-stabilization as a tool for control of functional phenomena.

Original languageEnglish (US)
Article number104420
JournalPhysical Review Materials
Volume3
Issue number10
DOIs
StatePublished - Oct 28 2019

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Meisenheimer, P. B., Williams, L. D., Sung, S. H., Gim, J., Shafer, P., Kotsonis, G. N., Maria, J. P., Trassin, M., Hovden, R., Kioupakis, E., & Heron, J. T. (2019). Magnetic frustration control through tunable stereochemically driven disorder in entropy-stabilized oxides. Physical Review Materials, 3(10), [104420]. https://doi.org/10.1103/PhysRevMaterials.3.104420