Thermal expansion of superconduct

T. Asahi, H. Suzuki, M. Nakamura, H. Takano, J. Kobayashi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Temperature dependences of thermal strains of superconducting (Formula presented)(Formula presented)(Formula presented)(Formula presented) were measured by using the two-dimensional reciprocal-lattice method of x-ray diffraction in the temperature range between 15 and 300 K. Accuracies of measuring the lattice strains attained 1.6×(Formula presented). Very small anomalies of the lattice constants and lattice volume took place at (Formula presented) of the transition point. They were caused by definite discontinuities of the thermal-expansion coefficients. Using previously reported values of specific heat and isotropic compressibility a nearly temperature-independent equivalent Grüneisen parameter (Formula presented) was derived as 0.89±0.11. From the extrapolation of the lattice volume of the high-temperature phase into the superconducting temperature region, additive lattice strains were found to appear spontaneously in the superconducting phase. From this fact it was concluded that a structural phase transition of the second order took place with the onset of superconductivity.

Original languageEnglish
Pages (from-to)9125-9129
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number14
DOIs
Publication statusPublished - 1997 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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