High temperature spin-driven multiferroicity in ludwigite chromocuprate Cu2CrBO5

We report spin-driven multiferroicity above 100 K in the ludwigite Cu(II) oxyborate Cu2CrBO5. Spontaneous polarization, which reaches 35 μC m−2 at 5 K, appears below 120 K, concomitantly with an incommensurate antiferromagnetic order and complex magnetodielectric effects. In magnetically induced fer...

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Published in:Applied physics letters 2021-05, Vol.118 (19)
Main Authors: Damay, Françoise, Sottmann, Jonas, Fauth, François, Suard, Emmanuelle, Maignan, Antoine, Martin, Christine
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Chromium
Copper
Cuprates
Exchanging
Ferroelectric materials
Ferroelectricity
High temperature
Low temperature
Ludwigite
Transition temperature
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cited_by cdi_FETCH-LOGICAL-c362t-44b0d9a4703fc6eba8a85105979d49ec86187d525b70894318625eefe90c113f3
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container_issue 19
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container_title Applied physics letters
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creator Damay, Françoise
Sottmann, Jonas
Fauth, François
Suard, Emmanuelle
Maignan, Antoine
Martin, Christine
description We report spin-driven multiferroicity above 100 K in the ludwigite Cu(II) oxyborate Cu2CrBO5. Spontaneous polarization, which reaches 35 μC m−2 at 5 K, appears below 120 K, concomitantly with an incommensurate antiferromagnetic order and complex magnetodielectric effects. In magnetically induced ferroelectrics, multiferroicity usually appears at low temperature because of the competing magnetic exchanges needed to stabilize a magnetic spiral. The remarkably high transition temperature observed in Cu2CrBO5 originates from the presence of strong Cu–O–Cu magnetic super-exchange interactions, which are not weakened by Cu/Cr cationic disorder. Our result provides an important contribution to the search for high temperature spin-driven multiferroics among low-dimensional cuprates.
doi_str_mv 10.1063/5.0049174
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP_美国物理联合会现刊（与NSTL共建）
subjects Antiferromagnetism
Applied physics
Chromium
Copper
Cuprates
Exchanging
Ferroelectric materials
Ferroelectricity
High temperature
Low temperature
Ludwigite
Transition temperature
title High temperature spin-driven multiferroicity in ludwigite chromocuprate Cu2CrBO5
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