2006
DOI: 10.1103/physrevlett.96.097601
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Ferroelectricity Induced by Acentric Spin-Density Waves inYMn2O5

Abstract: The commensurate and incommensurate magnetic structures of the magnetoelectric system YMn 2 O 5 , as determined from neutron diffraction, were found to be spin-density waves lacking a global center of symmetry. We propose a model, based on a simple magneto-elastic coupling to the lattice, which enables us to predict the polarization based entirely on the observed magnetic structure. Our data accurately reproduce the temperature-dependence of the spontaneous polarization, in particular its sign reversal at the … Show more

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Cited by 227 publications
(271 citation statements)
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References 12 publications
(33 reference statements)
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“…Similar sequences of ferroelectric phases are found in other RMn 2 O 5 compounds [35][36][37], where R = Bi, Y or a rare-earth heavier than Nd. In these compounds, at variance with TbMn 2 O 5 in which the pseudo-proper coupling occurs between distinct components of the same order-parameter, the pseudo-proper coupling is created between two distinct four-component order-parameters associated with the wave-vector k = (k x , 0, k z ).…”
Section: Epj Web Of Conferencessupporting
confidence: 49%
“…Similar sequences of ferroelectric phases are found in other RMn 2 O 5 compounds [35][36][37], where R = Bi, Y or a rare-earth heavier than Nd. In these compounds, at variance with TbMn 2 O 5 in which the pseudo-proper coupling occurs between distinct components of the same order-parameter, the pseudo-proper coupling is created between two distinct four-component order-parameters associated with the wave-vector k = (k x , 0, k z ).…”
Section: Epj Web Of Conferencessupporting
confidence: 49%
“…A variety of such mechanisms have been proposed [6]: magneto-striction is the only allowed mechanism for acentric collinear structures, and is active in the Ising system Ca 3 (Co,Mn) 2 O 6 [7] and, most likely, in the commensurate phase of YMn 2 O 5 [8]. Most other "type-II" multiferroics are cycloidal magnets, where non-collinear spins are key ingredients in the context of the so-called spincurrent model [9,10].…”
mentioning
confidence: 99%
“…With the recent advances in first-principles density-functional methods for predicting [4] and in novel synthetic techniques for growing new FM-FE multiferroics, the focus has now turned to how to produce a strong coupling between the two distinct order parameters [5]. Recently, attention has focused on a mechanism in which magnetic order itself breaks inversion symmetry [6,7,8,9]. Based on this, remarkable control of the FE state by an applied magnetic field has been demonstrated in some rare-earth manganites [10,11], however, the natural scale of the spontaneous polarization thus induced is very small, of the order of nC/cm 2 .…”
mentioning
confidence: 99%