ELASTIC-CONSTANTS, DEBYE TEMPERATURES, AND ELECTRON-PHONON PARAMETERS OF SUPERCONDUCTING CUPRATES AND RELATED OXIDES

Using both measurements and modeling, we studied the cohesive and related properties of several oxides. Superconducting oxides include La185Sr0 15Cu04., Y1Ba2Cu307and (Bi-Pb)2Sr2Ca2Cu3Ol0. Related nonsuperconducting oxides include SrXi03BaTi03and La2Cu04. For these materials, we give the complete quasiisotropic elastic constants corrected to the void-free state. From elastic constants and atomic volume, we calculated Debye characteristic temperatures, ΘD. Using Kresin's model, valid for all values of the electron-phonon parameter, A, we estimated λ from Tcand ΘD. For the superconducting cuprates, λ ranges from 1.3 (La-O) to 10.0 (Tl-O). Except perhaps for Tl-O, these parameters fall within a range predicted by theory. For all the above materials, we show the 295-5-K variation of ΘD. We support our elastic-constant measurements with Born-model calculations of the bulk modulus. © 1990, Taylor & Francis Group, LLC. All rights reserved.