Observation of an exotic lattice structure in the transparent KTa_(1-x)Nb_xO_3 perovskite supercrystal

Leonardo Lo Presti; Jacopo Parravicini; Raffaella Soave; Gianbattista Parravicini; Michelc Mauri; Laura Loconte; Fabrizio Di Mei; Ludovica Falsi; Luca Tartara; Simona Binetti; Aharon J. Agranat; Eugenio DelRe

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Observation of an exotic lattice structure in the transparent KTa_(1-x)Nb_xO_3 perovskite supercrystal

机译：观察透明kta_（1-x）Nb_xo_3 perovskite supercrystal的异国晶格结构

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We perform redundant x-ray diffraction versus temperature experiments in bulk transparent KTN. We find a violation of the standard perovskite cubic-to-tetragonal symmetry breaking at the Curie point in the form of an orthorhombic cell distortion. The lattice distortion spans coherently macroscopic volumes of the sample and is characterized by a negative-to-zero thermal volume expansion. Dielectric measurements and calorimetry indicate that the anomalous behavior is not associated to a distinct thermodynamic phase. The comparison of linear and nonlinear optical scattering experiments with structural data suggests that the lattice distortion is a consequence of strain relaxation to a 3D superlattice of polarization vortices.

机译：我们在散装透明KTN中执行冗余的X射线衍射与温度实验。我们发现违反了在正交细胞变形的形式的居里点处破裂的标准钙钛矿立方与四方对称。晶格变形跨越样品的相干宏观体积，其特征在于负至零的热量膨胀。电介质测量和量热法表明异常行为与不同的热力学相没有相关。结构数据的线性和非线性光散射实验的比较表明，晶格变形是应变松弛对偏振涡流的3D超晶格的结果。

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《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214110.1-214110.10|共10页
作者
Leonardo Lo Presti; Jacopo Parravicini; Raffaella Soave; Gianbattista Parravicini; Michelc Mauri; Laura Loconte; Fabrizio Di Mei; Ludovica Falsi; Luca Tartara; Simona Binetti; Aharon J. Agranat; Eugenio DelRe;
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Dipartimento di Chimica Universita degli Studi di Milano I-20133 Milano Italy;

Dipartimento di Scienza dei Materiali Universita di Milano-Bicocca I-20125 Milano Italy;

Istituto di Scienze e Tecnologie Chimiche 'Giulio Natta' (SCITEC) Italian CNR I-20133 Milano Italy;

Dipartimento di Fisica Universita di Pavia I-27100 Pavia Italy;

Dipartimento di Scienza dei Materiali Universita di Milano-Bicocca I-20125 Milano Italy;

Dipartimento di Chimica Universita degli Studi di Milano I-20133 Milano Italy;

Dipartimento di Fisica 'Sapienza' Universita di Roma I-00185 Roma Italy;

Dipartimento di Fisica 'Sapienza' Universita di Roma I-00185 Roma Italy Dipartimento S.B.A.I. Sezione di Fisica 'Sapienza' Universita di Roma I-00I61 Roma Italy;

Dipartimento di Ingegneria Industriale e dell' Informazione Universita di Pavia I-27100 Pavia Italy;

Dipartimento di Scienza dei Materiali Universita di Milano-Bicocca I-20125 Milano Italy;

Applied Physics Department Hebrew University of Jerusalem IL-9I904 Jerusalem Israel;

Dipartimento di Fisica 'Sapienza' Universita di Roma I-00185 Roma Italy ISC-CNR 'Sapienza' Universita di Roma I-00185 Roma Italy;

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1. Large-scale modelling of the phase transitions in KTa_(1-x)Nb_xO_3 perovskite solid solutions [J] . R. I. Eglitis, D. Fuks, S. Dorfman, Materials science in semiconductor processing . 2002,第2a3期

机译：KTa_（1-x）Nb_xO_3钙钛矿固溶体中相变的大规模建模
2. Polar catastrophe and the structure of KTa_(1-x)Nb_xO_3 surfaces: Results from elastic and inelastic helium atom scattering [J] . F. A. Flaherty, T. W. Trelenberg, J. A. Li, Physical review . 2015,第3期

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Observation of an exotic lattice structure in the transparent KTa_(1-x)Nb_xO_3 perovskite supercrystal

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