Phenomenological correlations in high-temperature superconductors
1 Department of Physics, City College of the City University of New York - 160 Convent Avenue, New York 10031, NY, USA
2 LIP, Department of Physics, University of Coimbra - 3004-516 Coimbra, Portugal, EU
Received: 26 February 2014
Accepted: 25 June 2014
An interpretation of the quadratic parameter of the Ginzburg-Landau theory of superconductivity is presented in this paper. The negative term in the potential, which allows the spontaneous symmetry breaking, is interpreted as a direct contribution from the energy gap at the Fermi surface to the effective potential. As a result, in the London approximation of the Ginzburg-Landau theory for type-II superconductors, a strong correlation is predicted and observed between the upper critical field at zero kelvin and the critical temperature in high-temperature superconductors.
PACS: 74.20.-z – Theories and models of superconducting state / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© EPLA, 2014