Artículos de revistas
Multiferroicity in an organic charge-transfer salt that is suggestive of electric-dipole-driven magnetism
Fecha
2012-09-01Registro en:
Nature Materials, v. 11, n. 9, p. 755-758, 2012.
1476-1122
1476-4660
10.1038/nmat3400
2-s2.0-84866396581
Autor
University of Augsburg
Goethe-University Frankfurt
Kyoto Sangyo University
Argonne National Laboratory
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Multiferroics, showing simultaneous ordering of electrical and magnetic degrees of freedom, are remarkable materials as seen from both the academic and technological points of view. A prominent mechanism of multiferroicity is the spin-driven ferroelectricity, often found in frustrated antiferromagnets with helical spin order. There, as for conventional ferroelectrics, the electrical dipoles arise from an off-centre displacement of ions. However, recently a different mechanism, namely purely electronic ferroelectricity, where charge order breaks inversion symmetry, has attracted considerable interest. Here we provide evidence for ferroelectricity, accompanied by antiferromagnetic spin order, in a two-dimensional organic charge-transfer salt, thus representing a new class of multiferroics. We propose a charge-order-driven mechanism leading to electronic ferroelectricity in this material. Quite unexpectedly for electronic ferroelectrics, dipolar and spin order arise nearly simultaneously. This can be ascribed to the loss of spin frustration induced by the ferroelectric ordering. Hence, here the spin order is driven by the ferroelectricity, in marked contrast to the spin-driven ferroelectricity in helical magnets. © 2012 Macmillan Publishers Limited. All rights reserved.