期刊
FRONTIERS OF PHYSICS
卷 9, 期 1, 页码 82-89出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-013-0395-8
关键词
pyrochlore oxides; multiferroics; magnetically induced ferroelectricity
资金
- National Basic Research Program of China (973 Project) [2011CB922101]
- National Natural Science Foundation of China [11234005, 11374147, 51332006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, China
Double pyrochlore Dy2Ru2O7 is synthesized and its magnetism and ferroelectricity below the Ru4+ spin ordering temperature (similar to 100 K) are investigated. The ferroelectric transition appears at similar to 18 K, much higher than the Dy3+ spin ordering point at similar to 1.8 K and lower than the Ru4+ spin ordering point at similar to 100 K. The measured electric polarization at similar to 2 K is as big as 145 mu C/m(2) in the polycrystalline samples. It is argued that the ferroelectricity is possibly ascribed to the electric dipole ordering arising from the collective monopole excitations in the Dy3+ tetrahedrons in prior to the Dy3+ spin ordering into spin-ice like state below similar to 1.8 K.
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