Higher-order elastic constants of La1.84Sr0.16CuO4 high-temperature superconductor |
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Authors: | B. Singh S. Gupta S.C. Goyal |
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Affiliation: | aDepartment of Physics, Agra College, Agra 282 002, India |
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Abstract: | Finite deformation theory is used to obtain the strain energy density of a tetragonal 2–1–4-type single crystal of the high-temperature superconductor La2−xSrxCuO4. The complete set of second and third-order elastic constants of the high-temperature superconductor La2−xSrxCuO4 (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 La2−xSrxCuO4 (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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Keywords: | High-Tc superconductor Elastic constants |
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