Charging effects on the critical temperature of the Josephson-coupled layered superconductors

E. P. Nakhmedov*, Ö Çakroglu, M. Hüner, K. Al-Shibani

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Effects of quantum phase fluctuations on the critical temperature Tc of Josephson-coupled layered superconductors are considered. Tc is shown to decrease nonlinearly with increasing charge fluctuations. The results obtained for the critical temperature by applying the self-consistent mean field method reveal no phase transition from superconducting state to normal metal for a finite value of charging energy. The destruction of the long range phase coherence appeared to occur at asymptotically large values of self-capacitance charging. For the weak quantum phase fluctuations limit, Tc is obtained to be vary in the interval of Tc* < Tc < T(2)c, where T(2)c is the critical temperature for a single superconducting layer evaluated by the mean field theory, and Tc* is the temperature when the phase coherence between the nearest neighboring layers is lost. Since Tc approaches Tc* with vanishing interlay er tunneling integral J. Calculation of the dependence of the transverse stiffness on the charging energy is carried out at T=0. The reentrance found can in principle occur at a sufficiently large value of the interlayer tunneling integral J > Jcr = kT(2)c, where Jcr≈ kT(2)c is the value of J when the superconductor normal metal phase transition takes place. However, the condition J≥ kT(2)c contradicts to the existence of the Josephson coupling between superconducting layers.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)307-318
Sayfa sayısı12
DergiPhysica C: Superconductivity and its Applications
Basın numarası3-4
Yayın durumuYayınlandı - 20 Şub 1998

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