Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors
TT 14.7: Vortrag
Dienstag, 24. März 2009, 11:30–11:45, HSZ 105
Superconductivity in quasi-2D systems within the BCS approach: Predictions of high-Tc superconductivity in hydrogen-graphite system — •Nicolas Garcia and Pablo Esquinazi — Division of Superconductivity and Magnetism, University of Leipzig, D-04103 Leipzig
Using the BCS approach, the local density and phonon spectra we calculate the superconducting gap at T = 0 K for metalizing hydrogen in a 2D graphene system. The aim is to estimate the critical temperature in quasi 2D graphite-hydrogen system. The calculation is done as a function of the density of conduction electrons n induced by the hydrogen and their effective mass. The results indicate that for n ∼ 5 × 1014 cm−2 and an effective mass equal to the free electron mass, the superconducting gap has a maximum of 40K with a Maxwell-like distribution as a function of n. The results provide a possible explanation for the recently reported granular superconducting-like behavior in graphite and multigraphene samples.