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4th International Conference on Physics

Berlin, Germany

Dragos Victor Anghel

Dragos Victor Anghel

Horia Hulubei National Institute of Physics and Nuclear Engineering, Romania

Title: Peculiarities of the BCS theory of superconductivity

Biography

Biography: Dragos Victor Anghel

Abstract

We study the effect of the relative value of the chemical potential with respect to the middle of the attraction band, on
the results of the BCS theory of superconductivity. In this way, we observe that the phenomenology predicted by the
theory is much richer than previously expected. If the attraction band (i.e. the interval in which the pairing interaction is
manifested) is not symmetric with respect to the chemical potential, then the equation for the energy gap has two solutions,
the superconductor-normal metal phase transition temperature is changed, and the phase transition may become of the first
order. The phase transition temperature decreases with the asymmetry, so, if the asymmetry is modified by doping of the
superconductor or by applying pressure, then a structure similar to the so called superconducting dome is formed if we plot
the transition temperature vs. doping or pressure.