Pressure-induced polarization reversal in multiferroic YMn2O5

被引：33
|
作者：
Chaudhury, Rajit P. [1 ,2 ]
dela Cruz, Clarina R. [3 ,4 ]
Lorenz, Bernd [1 ,2 ]
Sun, Yanyi [1 ,2 ]
Chu, Ching-Wu [1 ,2 ,5 ,6 ]
Park, S. [7 ,8 ]
Cheong, Sang-W. [7 ,8 ]
机构：
[1] Univ Houston, Dept Phys, Houston, TX 77204 USA
[2] Univ Houston, TCSUH, Houston, TX 77204 USA
[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[6] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China
[7] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[8] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.77.220104
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The low-temperature ferroelectric polarization of multiferroic YMn2O5 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 RMn2O5 compounds and they show the importance of magnetic frustration as well as the spin-lattice coupling.
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页数：4
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