Friday, May 3, 2013

1305.0063 (Jeffery L. Tallon et al.)

Coexistence of the superconducting energy gap and pseudogap above and
below the transition temperature of superconducting cuprates

Jeffery L. Tallon, Felix Barber, James G. Storey, John W. Loram
We express the superconducting gap, $\Delta(T)$, in terms of thermodynamic functions in both $s$- and d-wave symmetries. Applying to Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ and Y$_{0.8}$Ca$_{0.2}$Ba$_2$Cu$_3$O$_{7-\delta}$ we find that for all dopings $\Delta(T)$ persists, as a partial gap, high above $T_c$ due to strong superconducting fluctuations. Therefore in general two gaps are present above $T_c$, the superconducting gap and the pseudogap, effectively reconciling two highly polarized views concerning pseudogap physics.
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