Strong-Coupling Superconductors, the Mössbauer Effect, and Localized Impurity Modes
- 1 February 1970
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 1 (3) , 1103-1106
- https://doi.org/10.1103/physrevb.1.1103
Abstract
McMillan has recently proposed that in the strong-coupling theory of superconductivity certain expectation values for the lattice eigenfrequencies play a dominant role. We point out here that the Mössbauer effect can measure the important parameter in McMillan's theory in a rather direct fashion. Local-impurity-model calculations assuming isotopic impurities are presented, suggesting that McMillan's parameter is locally enhanced by heavy impurities in light lattices.Keywords
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