# Symmetry Breaking in the Perovskite SrTiO3

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Solid-solid phase transitions result when at least one normal mode of the system softens (i.e. becomes weaker) as the temperature decreases. Once the temperature is decreased below a critical temperature , the higher symmetry structure is no longer stable and the lattice distorts to form a new structure with lower symmetry. This results in a second-order phase transition, since the entropy and free-energy vary continuously with temperature while the heat capacity is discontinuous at .

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Contributed by: Eric R. Bittner (March 2012)

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References

[1] J. F. Scott, "Soft-Mode Spectroscopy: Experimental Studies of Structural Phase Transitions," *Reviews of Modern Physics*, 48(1), 1974 pp. 83–128.

[2] V. L. Ginzburg and L. D. Landau, *Journal of Experimental and Theoretical Physics*, 20, 1950 p. 1064.

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