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

doi:10.1209/0295-5075/107/36006

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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Abstract

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 language	English (US)
Article number	36006
Journal	EPL
Volume	107
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/107/36006
State	Published - Aug 1 2014

ASJC Scopus subject areas

General Physics and Astronomy

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Weng, S. C., Xu, R., Said, A. H., Leu, B. M., Ding, Y., Hong, H., Fang, X., Chou, M. Y., Bosak, A., Abbamonte, P., Cooper, S. L., Fradkin, E., Chang, S. L., & Chiang, T. C. (2014). Pressure-induced antiferrodistortive phase transition in SrTiO₃: Common scaling of soft-mode with pressure and temperature. EPL, 107(3), Article 36006. https://doi.org/10.1209/0295-5075/107/36006

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

abstract = "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.",

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

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T2 - Common scaling of soft-mode with pressure and temperature

AU - Weng, Shih Chang

AU - Xu, Ruqing

AU - Said, Ayman H.

AU - Leu, Bogdan M.

AU - Ding, Yang

AU - Hong, Hawoong

AU - Fang, Xinyue

AU - Chou, M. Y.

AU - Bosak, A.

AU - Abbamonte, P.

AU - Cooper, S. L.

AU - Fradkin, E.

AU - Chang, S. L.

AU - Chiang, T. C.

PY - 2014/8/1

Y1 - 2014/8/1

N2 - 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.

AB - 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.

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