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arXiv · 1106.4077

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

Haruhiko Kuroe·Tomohiro Hosaka·Suguru Hachiuma·Tomoyuki Sekine·Masashi Hase·Kunihiko Oka·Toshimitsu Ito·Hiroshi Eisaki·Masashi Fujisawa·Susumu Okubo·Hitoshi Ohta
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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.

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Haruhiko Kuroe, Tomohiro Hosaka, Suguru Hachiuma, Tomoyuki Sekine, Masashi Hase, Kunihiko Oka, Toshimitsu Ito, Hiroshi Eisaki, Masashi Fujisawa, Susumu Okubo, Hitoshi Ohta. 2011-08-10. Electric polarization induced by Neel order without magnetic superlattice: experimental study of Cu3Mo2O9 and numerical study of a small spin cluster. https://doi.org/10.1143/jpsj.80.083705

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