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Anomalous behaviour of the chemical potential in superconductors with a low density of charge carriers

. Physica C: Superconductivity, 165 (1): 35--43 (January 1990)
DOI: 10.1016/0921-4534(90)90429-I

Abstract

We discuss the behaviour near Tc of the chemical potential in superconductors with a dilute gas of interacting fermions. It is shown that at Tc there exists an anomaly in the chemical potential that distinguishes superconductors with Δ and EF of comparable magnitude from ordinary BCS superconductors (Δ EF). We predict the size of the anomaly for a number of existing superconductors and we argue, that if high-Tc superconductors are indeed special in the above sense, the anomaly is well in the observable range and could be used as an experimental test of the various “exotic” models of the superconducting mechanism.

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