Abstract
The effect on the superconducting transition temperature of exchanging for in has been studied. The concentration of the two isotopes has been determined by Rutherford backscattering spectroscopy and Raman spectroscopy confirmed the mass-related phonon frequency shift. The substitution is found to be the same on the two O sites. Magnetic measurements of the transition temperature reveal a nonzero isotope effect (α=0.16±0.02). The exponent α has also been calculated within a conventional electron-phonon interaction model and was found to be significantly larger.
- Received 2 July 1987
DOI:https://doi.org/10.1103/PhysRevLett.59.912
©1987 American Physical Society