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Abstract: MnWO4 has attracted attention because of its ferroelectric property inducedby frustrated helical spin order. Strong spin-lattice interaction is necessaryto explain ferroelectricity associated with this type of magnetic order.We haveconducted thermal expansion measurements along the a, b, c axes revealing theexistence of strong anisotropic lattice anomalies at T1=7.8 K, the temperatureof the magnetic lock-in transition into a commensurate low-temperature(reentrant paraelectric) phase. The effect of hydrostatic pressure up to 1.8GPa on the FE phase is investigated by measuring the dielectric constant andthe FE polarization. The low- temperature commensurate and paraelectric phaseis stabilized and the stability range of the ferroelectric phase is diminishedunder pressure.



Autor: R. P. Chaudhury, F. Yen, C. R. dela Cruz, B. Lorenz, Y. Q.Wang, Y. Y. Sun, C. W. Chu

Fuente: https://arxiv.org/







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