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Structural anomalies at the magnetic and ferroelectric transitions in RMn2O5 (R=Tb,Dy,Ho)

被引：83
作者：
dela Cruz, CR [1 ]
Yen, F
Lorenz, B
Gospodinov, MM
Chu, CW
Ratcliff, W
Lynn, JW
Park, S
Cheong, SW
机构：
[1] Univ Houston, Dept Phys, Houston, TX 77204 USA
[2] Univ Houston, TCSUH, Houston, TX 77204 USA
[3] Univ Houston, Dept Phys, Houston, TX 77204 USA
[4] Univ Houston, TCSUH, Houston, TX 77204 USA
[5] Bulgarian Acad Sci, Inst Solid State Phys, BU-1784 Sofia, Bulgaria
[6] Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[7] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China
[8] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[9] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[10] Rutgers State Univ, Ctr Emergent Mat, Piscataway, NJ 08854 USA
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.73.100406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Strong anomalies of the thermal expansion coefficients at the magnetic and ferroelectric transitions have been detected in multiferroic RMn2O5. Their correlation with anomalies of the specific heat and the dielectric constant is discussed. The results provide evidence for the magnetic origin of the ferroelectricity mediated by strong spin-lattice coupling in the compounds. Neutron scattering data for HoMn2O5 indicate a spin reorientation at the two low-temperature phase transitions.
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页数：4
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