Pressure-induced polarization reversal in multiferroic $YMn_2O_5$

Details Pressure-induced polarization reversal in multiferroic $YMn_2O_5$ Pressure-induced polarization reversal in multiferroic $YMn_2O_5$

2008-06-04

arxiv.org/abs/0806.0835v1

Phys. Rev. B 77, 220104(R) (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.220104

The low-temperature ferroelectric polarization of multiferroic $YMn_2O_5$ is completely reversed at a critical pressure of 10 kbar and the phase transition from the incommensurate to the commensurate magnetic phase is induced by pressures above 14 kbar. The high-pressure data correlate with thermal expansion measurements indicating a significant lattice strain at the low-temperature transition into the incommensurate phase. The results support the exchange striction model for the ferroelectricity in multiferroic $RMn_2O_5$ compounds and they show the importance of magnetic frustration as well as the spin-lattice coupling.

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