Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-21
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages 6 figures, in press in J. Phys. Soc. Jpn
Scientific paper
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.
Eisaki Hiroshi
Fujisawa Masashi
Hachiuma Suguru
Hase Masashi
Hosaka Tomohiro
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