Elastic constants of the polycrystalline Bi-Pb-Sr-Ca-Cu-O superconductor

Abstract

For polycrystalline For polycrystalline (Bi-Pb)2@Sr2Ca2Cu3O10, we report the 5–295-K elastic constants: shear modulus (G), Young modulus (E), bulk modulus (B), and Poisson ratio (ν). Both G and E show nearly normal temperature variation. During cooling, B softens between 215 and 65 K. The Poisson ratio decreases abruptly at 215 K and decreases almost five percent in the 295–5-K region. In its temperature dependence, this compound resembles YBa2Cu3O7. However, it shows much lower elastic stiffness. Corrected to the void-free state, we calculate a Debye temperature of 312 K, versus 436 K for YBa2Cu3O7. The Poisson ratio, 0.20, agrees well with that of YBa2Cu2O7, 0.21. We use Kresin’s model to interrelate Debye temperature, critical temprature, and electron-phonon interaction parameter for four classes of copper-oxide superconductors.

Source-reported materials — not catalogue approval

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