Field-induced reentrant novel phase and a ferroelectric-magnetic order coupling in HoMnO3 |
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Authors: | Lorenz B Litvinchuk A P Gospodinov M M Chu C W |
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Institution: | Department of Physics and TCSAM, University of Houston, Houston, Texas 77204-5002, USA. |
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Abstract: | A reentrant novel phase is observed in the hexagonal ferroelectric HoMnO3 in the presence of magnetic fields in the temperature range defined by a plateau of the dielectric constant anomaly. The plateau evolves with fields from a narrow dielectric peak at the Mn-spin rotation transition at 32.8 K in zero field. The anomaly appears both as a function of temperature and as a function of magnetic field without detectable hysteresis. This is attributed to the indirect coupling between the ferroelectric (FE) and antiferromagnetic (AFM) orders, arising from an FE-AFM domain wall effect. |
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