In KTaO3, oxygen-vacancy defect states produce the low-temperature SHG signal, and thermal fluctuations of the soft polar mode suppress that signal at higher temperatures, creating an effective inversion-symmetry crossover without a structural transition.
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Soft-Phonon-Driven Effective Inversion-Symmetry Crossover in Quantum Paraelectrics
In KTaO3, oxygen-vacancy defect states produce the low-temperature SHG signal, and thermal fluctuations of the soft polar mode suppress that signal at higher temperatures, creating an effective inversion-symmetry crossover without a structural transition.