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Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3

Journal Article · · Physical Review. B
The structural properties of the hexagonal multiferroic ℎ-HoMnO3 under high pressure have been explored using synchrotron x-ray diffraction and x-ray absorption spectroscopy in diamond anvil cells. The structure was found to undergo a pressure-induced phase transition at ~24 GPa to a rhombohedrally distorted superstructure, which is isostructural to the oxygen-loaded h-RMnO3+δ (R = Y,Dy,Ho,Er; δ ≈ 0.28) phases found in the same systems. The driving force behind the phase transition is the highly compressible ab plane which facilitates a gradual charge disproportionation of Mn(III) with pressure. We speculate this stabilizes the spin-liquid phase due to ferromagnetic coupling between neighboring Mn(II)/Mn(IV) and Mn(III). In addition, we demonstrate that the structural behavior is highly susceptible to nonhydrostatic conditions and the choice of pressure medium should be carefully made.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
Sponsoring Organization:
Independent Research Fund Denmark; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; FG02-94ER14466
OSTI ID:
2419442
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 13 Vol. 107; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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