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Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3
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DOI
- https://doi.org/10.1103/PhysRevB.107.134115
Final published version
- Martin Ottesen
- Emma Ehrenreich-Petersen ,
- Camilla Hjort Kronbo
- François Baudelet, Synchrotron Soleil ,
- Lucie Nataf, Synchrotron Soleil ,
- Innokenty Kantor, MAX IV Laboratory ,
- Mads Ry Vogel Jørgensen
- Martin Bremholm
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.
| Original language | English |
|---|---|
| Article number | 134115 |
| Journal | Physical Review B |
| Volume | 107 |
| Issue | 13 |
| Number of pages | 9 |
| ISSN | 2469-9950 |
| DOIs | |
| Publication status | Published - 1 Apr 2023 |
Bibliographical note
Funding Information:
We thank the Danish Agency for Science, Technology, and Innovation for funding the instrument center DanScatt. This research was funded by the Independent Research Fund Denmark (Grant No. 7027-00077A) and VILLUM FONDEN via the Centre of Excellence for Dirac Materials (Grant No. 11744). Portions of this work were performed at GeoSoilEnviroCARS (the University of Chicago, Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation–Earth Sciences (Grant No. EAR-1634415) and Department of Energy–Geosciences (Grant No. DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Use of the COMPRES-GSECARS gas-loading system was supported by COMPRES under NSF Cooperative Agreement No. EAR-1606856 and by GSECARS through NSF Grant No. EAR-1634415 and DOE Grant No. DE-FG02-94ER14466. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. We acknowledge MAX IV Laboratory for time on the beamline DanMAX under Proposal No. 20200703. Research conducted at MAX IV is supported by the Swedish Research Council under Contract No. 2018-07152, the Swedish Governmental Agency for Innovation Systems under Contract No. 2018-04969, and Formas under Contract No. 2019-02496. DanMAX is funded by the NUFI Grant No. 4059-00009B.
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© 2023 American Physical Society.
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