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Magnetic ordering in pressure-induced phases with giant spin-driven ferroelectricity in multiferroic TbMnO$$_{3}$$

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Osakabe, Toyotaka ; Kikkawa, Akiko*; Kitazawa, Hideaki*

We performed neutron diffraction experiments under high pressures and high magnetic fields using a single crystal of the multiferroic compound TbMnO$$_{3}$$ in order to clarify the mechanism associated with pressure/magnetic-field-induced giant ferroelectric polarization. We found that the E-type ordering of Mn spins induces giant ferroelectric polarization over all the parameter regions investigated, through an exchange striction mechanism. Furthermore, we propose that the polarization is reduced by polar ordering of the Tb moments in a zero magnetic field and is enhanced via the field-induced transition from polar to nonpolar Tb orderings at 2T.

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Category:Materials Science, Multidisciplinary

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