Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3
(2023) In Physical Review B 107(13).- Abstract
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... (More)
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.
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- author
- Ottesen, Martin ; Ehrenreich-Petersen, Emma ; Kronbo, Camilla Hjort ; Baudelet, François ; Nataf, Lucie ; Kantor, Innokenty LU ; Jørgensen, Mads Ry Vogel LU and Bremholm, Martin
- organization
- publishing date
- 2023-04-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 107
- issue
- 13
- article number
- 134115
- publisher
- American Physical Society
- external identifiers
-
- scopus:85158843399
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.107.134115
- language
- English
- LU publication?
- yes
- id
- 4a0b6d4a-e5d6-4a1f-82c2-e2fcdfb6e7d9
- date added to LUP
- 2023-08-11 14:02:16
- date last changed
- 2023-08-11 14:02:16
@article{4a0b6d4a-e5d6-4a1f-82c2-e2fcdfb6e7d9, abstract = {{<p>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.</p>}}, author = {{Ottesen, Martin and Ehrenreich-Petersen, Emma and Kronbo, Camilla Hjort and Baudelet, François and Nataf, Lucie and Kantor, Innokenty and Jørgensen, Mads Ry Vogel and Bremholm, Martin}}, issn = {{2469-9950}}, language = {{eng}}, month = {{04}}, number = {{13}}, publisher = {{American Physical Society}}, series = {{Physical Review B}}, title = {{Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3}}, url = {{http://dx.doi.org/10.1103/PhysRevB.107.134115}}, doi = {{10.1103/PhysRevB.107.134115}}, volume = {{107}}, year = {{2023}}, }