Abstract
We report unusual behavior of the low-temperature electrical resistivity of nonequilibrium substitutional solid solutions of the form . This behavior is thought to be similar to anomalies in observed in the tunneling or point-contact spectra of metals in the presence of disorder, and to result from strong electron-phonon interactions. The resistivity data, along with low-temperature heatcapacity measurements and Al x-ray-emission spectroscopy and NMR Knight shift experiments, strongly suggest that an enhancement of the electron-phonon interactions due to lattice instabilities is the main reason for the dramatic increase in the superconducting transition temperature to ∼11 K in when .
- Received 11 July 1994
DOI:https://doi.org/10.1103/PhysRevB.51.1112
©1995 American Physical Society