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Higher-order elastic constants of La1.84Sr0.16CuO4high-temperature superconductor

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
450
Identifiers
DOI: 10.1016/j.physc.2006.09.009
Keywords
  • High-Tcsuperconductor
  • Elastic Constants
Disciplines
  • Physics

Abstract

Abstract Finite deformation theory is used to obtain the strain energy density ϕ of a tetragonal 2–1–4-type single crystal of the high-temperature superconductor La 2− x Sr x CuO 4. The complete set of second and third-order elastic constants of the high-temperature superconductor La 2− x Sr x CuO 4 ( x = 0.16) is calculated by taking into account the interactions between nine nearest-neighbour atoms in the lattice and using Mie–Grüneisen interatomic potential. For the sake of comparison we have also computed the values of these constants for x = 0.13–0.20. The values of third-order elastic constants of La 2− x Sr x CuO 4 ( x = 0.13–0.20) are negative and their absolute magnitudes are one order higher than those of the second-order elastic constants.

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