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

Martin Ottesen; Emma Ehrenreich-Petersen; Camilla Hjort Kronbo; François Baudelet; Lucie Nataf; Innokenty Kantor; Mads Ry Vogel Jørgensen; Martin Bremholm

doi:10.1103/PhysRevB.107.134115

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

Martin Ottesen, Emma Ehrenreich-Petersen, Camilla Hjort Kronbo, François Baudelet, Lucie Nataf, Innokenty Kantor, Mads Ry Vogel Jørgensen, Martin Bremholm^*

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

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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 demonstrate that the structural behavior is highly susceptible to nonhydrostatic conditions and the choice of pressure medium should be carefully made.

Originalsprog	Engelsk
Artikelnummer	134115
Tidsskrift	Physical Review B
Vol/bind	107
Nummer	13
Antal sider	9
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.107.134115
Status	Udgivet - apr. 2023

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10.1103/PhysRevB.107.134115

Phys. Rev. B 107, 134115Forlagets udgivne version, 2,41 MBLicens: Andet

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title = "Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3",

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 demonstrate that the structural behavior is highly susceptible to nonhydrostatic conditions and the choice of pressure medium should be carefully made.",

author = "Martin Ottesen and Emma Ehrenreich-Petersen and Kronbo, {Camilla Hjort} and Fran{\c c}ois Baudelet and Lucie Nataf and Innokenty Kantor and J{\o}rgensen, {Mads Ry Vogel} and Martin Bremholm",

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T1 - Pressure-induced charge-transfer and structural transition in hexagonal multiferroic HoMnO3

AU - Ottesen, Martin

AU - Ehrenreich-Petersen, Emma

AU - Kronbo, Camilla Hjort

AU - Baudelet, François

AU - Nataf, Lucie

AU - Kantor, Innokenty

AU - Jørgensen, Mads Ry Vogel

AU - Bremholm, Martin

PY - 2023/4

Y1 - 2023/4

N2 - 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.

AB - 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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DO - 10.1103/PhysRevB.107.134115

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