Kohn Anomaly Energy in Conventional Superconductors Equals Twice the Energy of the Superconducting Gap: How and Why?
Kohn anomaly occurs in metals as a weak but discernible kink in the phonon spectrum around 2kF arising out of screened Coulombic interaction. Over the years this has been observed in a number of normal metallic systems. As a major surprise however, the recent neutron spin-echo experiments on elemental (conventional) superconductors Pb and Nb reveal a very important and striking relation that Kohn (anomaly) energy equals twice the energy of the superconducting gap. In this paper we explore the...[Show more]
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|Source:||International Journal of Modern Physics B|
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