Spin amplitude modulation driven magnetoelectric coupling in the new multiferroic FeTe2O5Br.
Phys Rev Lett
; 103(14): 147202, 2009 Oct 02.
Article
em En
| MEDLINE
| ID: mdl-19905598
ABSTRACT
The magnetic and ferroelectric properties of the layered geometrically frustrated cluster compound FeTe2O5Br were investigated with single-crystal neutron diffraction and dielectric measurements. An incommensurate transverse amplitude modulated magnetic order with the wave vector q=(1/2,0.463,0) develops below T(N)=10.6(2) K. Simultaneously, a ferroelectric order due to exchange striction involving polarizable Te4+ lone-pair electrons develops perpendicular to q and to Fe3+ magnetic moments. The observed magnetoelectric coupling is proposed to originate from the temperature dependent phase difference between neighboring amplitude modulation waves.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Eslovênia