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Superconducting strong coupling

Abstract In strong-coupling superconductors with a short electron mean free path the self-energy effects in the superconducting order parameter play a major role in the phonon manifestation of the point-contact spectra at above-gap energies. We compare the expressions for the nonlinear conductivity of tunnel, ballistic, and diffusive point-contacts and show that these expression are similar and correspond to the measurements of the phonon structure in the point-contact spectra for the 7r-band of MgB2. [Pg.249]

Prom the linear coefficient, 7, a value of AC/ yTc = 1-6 0.2 is obtained which is only slightly larger than the BCS prediction of 1.43. However, when plotting the difference between the specific heat in the superconducting and normal state a clear deviation from the BCS behavior (solid line in Fig. 2.31b) [214] is seen. The measured C below falls off more steeply than predicted. This is an indication for strong coupling. [Pg.52]

Zh91c Z. Zhang, C.-C. Chen and C. M. Lieber, Tunneling Spectroscopy of MaCeo Superconductors The Energy Gap, Strong Coupling, and Superconductivity, Science 254, 1619-1621 (1991). [Pg.118]

Tunneling Spectroscopy of M3C50 Superconductors The Energy Gap, Strong Coupling, and Superconductivity... [Pg.173]

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See also in sourсe #XX -- [ Pg.565 ]



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Strong coupling

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