Resumo

CONTRERAS, P.; FLOREZ, J.  e  ALMEIDA, Rafael. Symmetry field breaking effects in Sr₂RuO₄. Rev. mex. fis. [online]. 2016, vol.62, n.5, pp.442-449. ISSN 0035-001X.

In this work, after reviewing the theory of the elastic properties of Sr2RuO4, an extension suitable to explain the sound speed experiments of Lupien et al. and Clifford et al. is carried out. It is found that the discontinuity in the elastic constant C66 gives unambiguous experimental evidence that the Sr2RuO4 superconducting order parameter Ψ has two components and shows a broken time-reversal symmetry state. A detailed study of the elastic behavior is performed by means of a phenomenological theory employing the Ginzburg-Landau formalism.

Palavras-chave : Elastic properties; unconventional superconductors; time reversal symmetry; Ginzburg-Landau theory; sound speed.

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