Electric polarization induced by Neel order without magnetic superlattice: experimental study of Cu3Mo2O9 and numerical study of a small spin cluster

Abstract

We clarify that the antiferromagnetic order in the distorted tetrahedral quasi-one dimensional spin system induces electric polarizations. In this system, the effects of the low dimensionality and the magnetic frustration are expected to appear simultaneously. We obtain the magnetic-field-temperature phase diagram in Cu3Mo2O9 by studying the dielectric constant and the spontaneous electric polarization. Around the tricritical point at 10 T and 8 K, the change of the direction in the electric polarization causes a colossal magnetocapacitance. We calculate the charge redistribution in the small spin cluster consisting of two magnetic tetrahedra to demonstrate the electric polarization induced by the antiferromagnetism.

10 pages 6 figures, in press in J. Phys. Soc. Jpn

References in corpus (4)

• Spin current and magneto-electric effect in non-collinear magnets
• Electronic Orbital Currents and Polarization in Mott Insulators
• Spin electric effects in molecular antiferromagnets
• Successive phase transitions to antiferromagnetic and weak-ferromagnetic long-range orders in quasi-one-dimensional antiferromagnet Cu${}_3$Mo${}_2$O${}_9$

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• Muon spin spectroscopy in multiferroic (Cu,Zn)${}_3$Mo${}_2$O${}_9$