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000022143 1001_ $$0P:(DE-Juel1)VDB106374$$aRushchanskii, K. Z.$$b0$$uFZJ
000022143 245__ $$aFirst-principles prediction of oxygen octahedral rotations in perovskite-structure EuTiO3
000022143 260__ $$aCollege Park, Md.$$bAPS$$c2012
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000022143 500__ $$3POF3_Assignment on 2016-02-29
000022143 500__ $$aThis work was supported by the Young Investigators Group Programme of the Helmholtz Association, Germany, contract VH-NG-409 and by the ETH Zurich. We thank S. Kamba, R. Hermann, J. Hlinka, W. Kleemann, C. Fennie, S. Blugel, and I. Slipukhina for discussions and gratefully acknowledge the support of Julich Supercomputing Centre.
000022143 520__ $$aWe present a systematic first-principles study of the structural and vibrational properties of perovskite-structure EuTiO3. Our calculated phonon spectrum of the high-symmetry cubic structural prototype shows strong M-and R-point instabilities, indicating a tendency to symmetry-lowering structural deformations composed of rotations and tilts of the oxygen octahedra. Subsequent explicit study of 14 different octahedral tilt-patterns showed that the I4/mcm, Imma, and R (3) over barc structures, all with antiferrodistortive rotations of the octahedra, have significantly lower total energy than the prototype Pm (3) over barm structure. We discuss the dynamical stability of these structures, and the influence of the antiferrodistortive structural distortions on the vibrational, optical, and magnetic properties of EuTiO3, in the context of recent unexplained experimental observations.
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