Stabilization of orthorhombic distortions in Cu-doped and Co-doped ferrimagnetic Mn3 O4

Kee Hwan Lee, In Yong Hwang, Jae Ho Chung, Hiroki Ishibashi, Yoshiki Kubota, Shogo Kawaguchi, Sanghyun Lee, Shuki Torii, Masato Hagihala, Takahashi Kamiyama

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Abstract

Using synchrotron X-ray diffraction, we investigate how the tetragonal-to-orthorhombic phase transition in the ferrimagnetic (c>a) spinel Mn3O4 is driven by the t2 orbital degeneracy of Cu2+(3d9) ions doped in its tetrahderal sites. At high temperatures where the orthorhombic phase initially appears, we observe that the local elongations of Cu-doped tetrahedra cause the unit cells to contract along the same direction. The signs of the local and global lattice strains finally agree with each other when the orthorhombic phase transition is completed below TN=42.5 K. Using neutron diffraction, we report that Co2+(3d7) doping also stabilizes the orthorhombic phase but without enhancing the associated lattice strains. These results are consistent with the scenario that the orthorhombic instability of the undoped Mn3O4 is driven by the spin-lattice coupling.

Original languageEnglish
Article number085126
JournalPhysical Review B
Volume101
Issue number8
DOIs
Publication statusPublished - 2020 Feb 15

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Lee, K. H., Hwang, I. Y., Chung, J. H., Ishibashi, H., Kubota, Y., Kawaguchi, S., Lee, S., Torii, S., Hagihala, M., & Kamiyama, T. (2020). Stabilization of orthorhombic distortions in Cu-doped and Co-doped ferrimagnetic Mn3 O4. Physical Review B, 101(8), [085126]. https://doi.org/10.1103/PhysRevB.101.085126