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Magnetoelectric effect and phase transitions in CuO in external magnetic fields

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Magnetoelectric effect and phase transitions in CuO in external magnetic fields

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Título Magnetoelectric effect and phase transitions in CuO in external magnetic fields
Autor Wang, Zhaosheng
Qureshi, Navid
Yasin, Shadi
Mukhin, Alexander
Ressouche, Eric
Zherlitsyn, Sergei
Skourski, Yurii
Geshev, Julian Penkov
Ivanov, Vsevolod
Gospodinov, Marin
Skumryev, Vassil
Resumo Apart from being so far the only known binary multiferroic compound, CuO has a much higher transition temperature into the multiferroic state, 230 K, than any other known material in which the electric polarization is induced by spontaneous magnetic order, typically lower than 100 K. Although the magnetically induced ferroelectricity of CuO is firmly established, no magnetoelectric effect has been observed so far as direct crosstalk between bulk magnetization and electric polarization counterparts. Here we demonstrate that high magnetic fields of E50 T are able to suppress the helical modulation of the spins in the multiferroic phase and dramatically affect the electric polarization. Furthermore, just below the spontaneous transition from commensurate (paraelectric) to incommensurate (ferroelectric) structures at 213 K, even modest magnetic fields induce a transition into the incommensurate structure and then suppress it at higher field. Thus, remarkable hidden magnetoelectric features are uncovered, establishing CuO as prototype multiferroic with abundance of competitive magnetic interactions.
Contido em Nature Communications. London. Vol. 7 (Jan. 2016), 10295, 8 p.
Assunto Campos magnéticos
Diagramas de fase
Óxido de cobre
Transformações de fase
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/165588
Arquivos Descrição Formato
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