Thermal expansion of Bi2.2Sr1.8CaCu2Ox ...

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Title Thermal expansion of Bi2.2Sr1.8CaCu2Ox superconductor single crystals
Author(s) Z. J. Yang, M. Yewondwossen, Derek W. Lawther, S. P. Ritcey, D. J. W. Geldart, R. A. Dunlap
Journal Journal of Superconductivity
Date 1995
Volume 8
Issue 2
Start page 233
End page 239
Abstract Using a low-temperature stage X-ray diffractometer, we have investigated the temperature dependence of the lattice parameters of single crystal superconductors Bi2.2Sr1.8CaCu2Ox. The experimental results show that (i) the lattice constants increase linearly with increasing temperature above about 100 K; (ii) the c-axis lattice parameter shows a kink in the superconducting transition region, while the a, b-axis parameters do not show any anomalous behavior in this region; (iii) both a, b, and c show negative thermal expansion coefficients below 40-50 K, which may be related to the characteristics of the Cu-O bond.

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