Home > Publications database > Local structural distortions drive magnetic molecular field in compositionally complex spinel oxide > print

001     637928
005     20251119161751.0
024 7 _ |a 10.1038/s41467-025-62268-x
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100 1 _ |a Nevgi, Rukma
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245 _ _ |a Local structural distortions drive magnetic molecular field in compositionally complex spinel oxide
260 _ _ |a [London]
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520 _ _ |a Understanding how local distortions determine the functional properties of high entropy materials, containing five or more elements at the same crystallographic site, is an open challenge. We address this for a compositionally complex spinel oxide (Mn$_{0.2}$Co$_{0.2}$Ni$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$)Cr$_2$O$_4$ (A$_5$Cr$_2$O$_4$). By comparatively examining extended X-ray absorption fine structure on A$_5$Cr$_2$O$_4$ and its parent counterparts, ACr$_2$O$_4$, along with density functional theory calculations for multiple configurations, we find that the element-specific distortions go beyond the first neighbor. Specifically, the strong Jahn-Teller distortion present in CuCr$_2$O$_4$ is found to be completely suppressed in A$_5$Cr$_2$O$_4$ even locally. Instead, there is a broad distribution of Cu-O and Cu-Cr bond distances, while other A-O distances acquire certain specific values. This study demonstrates the additional flexibility of a cationic sublattice in maintaining a uniform long-range structure, in contrast to previous reports showing only the accommodative anionic sublattice. The mean-field magnetic interactions of A$_5$Cr$_2$O$_4$ exhibit a striking resemblance to those of NiCr$_2$O$_4$, despite the presence of multiple magnetic ions and variable bond lengths. This originates from the comparability of bond lengths around Cr in both materials. Our study paves the way for a deeper understanding of the impact of local structural distortions on the physical properties of compositionally complex quantum materials.
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700 1 _ |a Dey, Subha
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700 1 _ |a Bhattacharya, Nandana
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700 1 _ |a Ershadrad, Soheil
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700 1 _ |a Dan, Tinku
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700 1 _ |a Chakravarty, Sujay
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700 1 _ |a Kaushik, S. D.
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700 1 _ |a Klewe, Christoph
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700 1 _ |a Sterbinsky, George E.
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700 1 _ |a Sanyal, Biplab
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700 1 _ |a Middey, Srimanta
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773 _ _ |a 10.1038/s41467-025-62268-x
|g Vol. 16, no. 1, p. 7038
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