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The low-temperature ferroelectric polarization of multiferroic $YMn_2O_5$ iscompletely reversed at a critical pressure of 10 kbar and the phase transitionfrom the incommensurate to the commensurate magnetic phase is induced bypressures above 14 kbar. The high-pressure data correlate with thermalexpansion measurements indicating a significant lattice strain at thelow-temperature transition into the incommensurate phase. The results supportthe exchange striction model for the ferroelectricity in multiferroic$RMn_2O_5$ compounds and they show the importance of magnetic frustration aswell as the spin-lattice coupling.

Pressure-induced polarization reversal in multiferroic $YMn_2O_5$