Friday, July 19, 2013

1307.4859 (A. Karmakar et al.)

Spin correlated dielectric memory and rejuvenation in relaxor
ferroelectric CuCrS2

A. Karmakar, K. Dey, S. Chatterjee, S. Majumdar, S. Giri
CuCrS2, a Heisenberg antiferromagnet with layered edge sharing triangular lattice, exhibits a spiral magnetic order. Dielectric (E) and polarization studies show magnetoelectric (ME) coupling at Neel temperature (T_N=38 K) where simultaneous dielectric and magnetic long range order occur. The compound shows a diffused ferroelectric (FE) transition and slow relaxation dynamics above T_N, indicative of relaxor FE behavior. Interestingly, memory effect and magnetic field induced rejuvenation are also observed in E, establishing cooperative glassy dynamics and ME coupling even above T_N. We discuss the role of geometrical frustration and metal ligand hybridization for these unusual properties.
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