Experimental observations of ferroelectricity in double pyrochlore Dy2Ru2O7
Authors:
- 26 October 2013
- journal article
- research article
- Published by China Engineering Science Press Co. Ltd. in Frontiers of Physics
- Vol. 9 (1) , 82-89
Abstract
Double pyrochlore Dy2Ru2O7 is synthesized and its magnetism and ferroelectricity below the Ru4+ spin ordering temperature (∼100 K) are investigated. The ferroelectric transition appears at ∼18 K, much higher than the Dy3+ spin ordering point at ∼1.8 K and lower than the Ru4+ spin ordering point at ∼100 K. The measured electric polarization at ∼2 K is as big as 145 μC/m2 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 ∼1.8 K.Keywords
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