Abstract
Compared to the previous report on [V. Gnezdilov et al., (arXiv:1604.04249)],where no dielectric anomaly was observed without magnetic field near , we further present the dielectric behaviors without and with magnetic field in . At zero field , an antiferromagnetic transition from magnetization and specific heat measurements is clearly established at , while no dielectric anomaly was observed. Those results are similar to the previous report [V. Gnezdilov et al., (arXiv:1604.04249)]. Above the critical field , a metamagnetic spin-flip transition from antiferromagnetic to ferrimagnetic order at is induced anisotropically only for . Meanwhile, a ferroelectric behavior from dielectric and pyroelectric current measurements is observed below ; then a corresponding type-II multiferroics emerges above . The key mechanism of the anisotropic spin-flip-induced multiferroicity in can be ascribed to the breaking of magnetic twofold symmetry in the plane above .
1 More- Received 15 August 2016
- Revised 2 February 2017
DOI:https://doi.org/10.1103/PhysRevB.95.125121
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