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

Ottesen, Martin ; Ehrenreich-Petersen, Emma ; Kronbo, Camilla Hjort ; Baudelet, François ; Nataf, Lucie ; Kantor, Innokenty LU ; Jørgensen, Mads Ry Vogel LU orcid and Bremholm, Martin (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
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organization
publishing date
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}},
}