Abstract
The mechanical properties of superconducting NdBa2Cu3O7 and non-superconducting NdBa2Cu3O6.60 have been measured between 80 and 300 K at 10 MHz. An anomaly in the longitudinal sound velocity indicating lattice-softening tendency between 160 and 230 K was observed in non-superconducting NdBa2Cu3O6.60 but not in superconducting NdBa2Cu3O7 (critical temperature, Tc = 93 K). The Debye temperature θD increased when the oxygen content was increased where θD = 313 K for NdBa2Cu3O6.6 and θD = 370 K for NdBa2Cu3O7 indicating hardening of the material with the superconducting phase. The electron-phonon coupling constant of the superconducting sample in the conventional three-dimensional BCS theory was λ = 0.67, and in the two-dimensional van Hove scenario, λvH = 0.046. The related elastic moduli of the samples are also reported in this paper.
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This research was supported by the Ministry of Education, Malaysia, under grant no. FRGS/1/2017/STG02/UKM/01/1.
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R Abd-Shukor designed the experiment, analyzed the data, and wrote the paper. MS Tang performed the experiments and initial data analysis.
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Abd-Shukor, R., Tang, M.S. Sound Velocity and Elastic Moduli of Superconducting and Non-superconducting NdBa2Cu3O7-δ. J Supercond Nov Magn 34, 43–47 (2021). https://doi.org/10.1007/s10948-020-05752-3
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DOI: https://doi.org/10.1007/s10948-020-05752-3