Unravelling the magnetic properties of Fe0.5TeSe0.5 superconductor using Ginzburg–Landau (GL) formulation

Abstract The Gibbs free energy of the magnetic superconductor FeTe 0.5 Se 0.5 has been analyzed in conjunction with the Werthamer–Helfand–Hohenberg (WHH) equation at a critical temperature (Tc) of 12 K. This study presents the temperature dependence of the upper critical magnetic field (Hc 2 ), coherence length (ξ GL ), penetration depth (λ GL ), and critical current density (Jc) of the FeTe 0.5 Se 0.5 superconductor. Using experimentally obtained values, phase diagrams were constructed, showing that Hc 2 , ξ GL , λ GL , and Jc exhibit non-linear temperature dependence and approach zero as T approaches Tc. The large values of the Ginzburg–Landau (GL) characteristic parameters indicate that FeTe 0.5 Se 0.5 is a strongly type-II superconductor. The results obtained in this work are in good agreement with previous experimental findings on FeTe 0.5 Se 0.5 superconductor.