Size-Dependent Polar Ordering in Colloidal GeTe Nanocrystals
Nano Letters2011Vol. 11(3), pp. 1147–1152
Citations Over TimeTop 10% of 2011 papers
Mark J. Polking, Jeffrey J. Urban, Delia J. Milliron, Haimei Zheng, Emory M. Chan, Marissa A. Caldwell, Simone Raoux, Christian Kisielowski, Joel W. Ager, R. Ramesh, A. Paul Alivisatos
Abstract
The question of the nature and stability of polar ordering in nanoscale ferroelectrics is examined with colloidal nanocrystals of germanium telluride (GeTe). We provide atomic-scale evidence for room-temperature polar ordering in individual nanocrystals using aberration-corrected transmission electron microscopy and demonstrate a reversible, size-dependent polar-nonpolar phase transition of displacive character in nanocrystal ensembles. A substantial linear component of the distortion is observed, which is in contrast with theoretical reports predicting a toroidal state.
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