Pressure-induced polarization reversal in multiferroic $YMn_2O_5$
Rajit P. Chaudhury, Clarina R. dela Cruz, Bernd Lorenz, Yanyi Sun,, Ching-Wu Chu, S. Park, and Sang-W. Cheong
TL;DR
This study demonstrates pressure-induced polarization reversal and magnetic phase transition in multiferroic YMn2O5, highlighting the role of lattice strain, magnetic frustration, and spin-lattice coupling in its ferroelectric properties.
Contribution
It provides new insights into how pressure influences ferroelectric and magnetic phases in YMn2O5, supporting the exchange striction model for multiferroic behavior.
Findings
Polarization is reversed at 10 kbar pressure.
Magnetic phase transition occurs above 14 kbar.
Lattice strain correlates with phase transitions.
Abstract
The low-temperature ferroelectric polarization of multiferroic 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 compounds and they show the importance of magnetic frustration as well as the spin-lattice coupling.
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