单晶SrTiO $_3$板的对称性破缺：EPR的表现
Symmetry breaking in single crystal SrTiO$_3$ plates: EPR manifestations
摘要：
杂质Fe $^{3+}$和Mn $^{4+}$中心的电子顺磁共振研究表明，在105 K以上的毫米级钛酸锶片的晶体结构的对称性降低，从立方到四方，从传统的低温反铁畸变相。它示出的效果并不源于残余应力;其大小（观察到的tetraquiny失真）和特定的表现形式取决于板的取向，表面质量和样品的几何形状。所观察到的现象的特殊性，其实现的可能方案进行了讨论。
英文摘要：
Electron paramagnetic resonance studies of the impurity Fe$^{3+}$ and Mn$^{4+}$ centers indicate that the symmetry of the crystal structure of millimeter-scale strontium titanate plates above 105 K lowers in the bulk from cubic to tetragonal, different from that of the conventional low-temperature antiferrodistortive phase. It is shown that the effect does not originate from the residual stress; its magnitude (observed tetragonal distortion) and particular manifestations depend on plate orientation, surface quality and the geometry of a sample. Peculiarities of the observed phenomenon are presented and possible scenario of its realization is discussed.
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