Cupric chloride CuCl2 as an S=1/2 chain multiferroic

Details Cupric chloride CuCl2 as an S=1/2 chain multiferroic Cupric chloride CuCl2 as an S=1/2 chain multiferroic

2010-08-31

arxiv.org/abs/1008.5226v1

Phys. Rev. B 82, 064424 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.064424

Magnetoelectric properties were investigated for an S=1/2 chain antiferromagnet CuCl2, which turns out to be the first example of non-chalcogen based spiral-spin induced multiferroics. Upon the onset of helimagnetic order propagating along the b-axis under zero magnetic field (H), we found emergence of ferroelectric polarization along the c-axis. Application of H along the b-axis leads to spin-flop transition coupled with drastic suppression of ferroelectricity, and rotation of H around the b-axis induces the rotation of spin-spiral plane and associated polarization direction. These behaviors are explained well within the framework of the inverse Dzyaloshinskii-Moriya model, suggesting the robustness of this magnetoelectric coupling mechanism even under the strong quantum fluctuation.

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