Pressure-induced antiferrodistortive phase transition in SrTiO3: Common scaling of soft-mode with pressure and temperature

Shih Chang Weng, Ruqing Xu, Ayman H. Said, Bogdan M. Leu, Yang Ding, Hawoong Hong, Xinyue Fang, M. Y. Chou, A. Bosak, P. Abbamonte, S. L. Cooper, E. Fradkin, S. L. Chang, T. C. Chiang

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We report a study of the pressure-induced antiferrodistortive cubic-to-tetragonal phase transition in strontium titanate (SrTiO3) at ambient temperature. High-resolution inelastic x-ray scattering measurements reveal the softening of a phonon mode at the zone boundary; a static distortion sets in at a critical pressure of 9.5 GPa, which corresponds to a critical volume reduction of 5.3%. Prior studies have shown that similar phonon softening and ensuing lattice distortion can be induced under ambient pressure by lowering the sample temperature through a critical temperature of 105 K. The relationship between the two phase transitions is clarified by comparing the power laws of the pressure and temperature dependences of the softening behavior. The results are explained in terms of the analytic properties of the soft mode.

Original languageEnglish (US)
Article number36006
Issue number3
StatePublished - Aug 1 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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