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Characterization of the Landau expansion equation for SrTiO_3 under pressure

机译:压力下SrTiO_3的Landau膨胀方程的表征

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This work focuses on the characterization of the expansion of Landaus main equation for Pm3m structures, which are transformed with symmetry subgroups, associated with M3 and R4 special points of the Brillouin zone, under hydrostatic pressure. This solution has been adapted to include the general influence of hydrostatic pressure and the evolution of the order parameter. We present a simple scheme in order to search systematically the ground state of all perovskite structures derivable from octahedral rotations under high pressure. We have applied this adaptation to SrTiO_3 perovskite. Results of the characterization of Landau′s equation for the cubictetragonal phase transition under pressure are discussed here.
机译:这项工作的重点是对在静水压力下用对称子组转换的Pm3m结构的Landaus主方程展开的表征,该对称子组与布里渊区的M3和R4特殊点相关。该解决方案已被调整为包括静水压力的一般影响和阶次参数的演变。我们提出了一个简单的方案,以便系统地搜索高压下八面体旋转衍生的所有钙钛矿结构的基态。我们已将这种适应方法应用于SrTiO_3钙钛矿。本文讨论了在压力下立方四方相变的Landau方程的表征结果。

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