Superconducting energy gap of2H−NbSe2in phonon spectroscopy

Direct observation of the superconducting gap in phonon spectra.

We show that the superconducting energy gap 2Delta can be directly observed in phonon spectra, as predicted by recent theories. In addition, since each phonon probes the gap on only a small part of the Fermi surface, the gap anisotropy can be studied in detail. Our neutron scattering investigation of the anisotropic conventional superconductor YNi2B2C demonstrates this new application of phonon...

Anisotropy of Energy Gap in Superconducting Aluminum

Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy.

Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparti...

Second superconducting energy gap of Nb3Sn observed by breakjunction point-contact spectroscopy

We report on investigations of the superconducting energy gap of the A15 superconductor Nb3Sn by pointcontact spectroscopy of breakjunctions. The voltage-dependent differential conductance dI /dV reveals features of a second energy gap besides the energy gap known from previous tunnel measurements with maxima at 1=3.92 0.16 meV and 2=0.85 0.17 meV as derived from a histogram summarizing the dat...

Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies.

Tunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc, the energy gap is 2D ­ 5.2 6 0.2 meV, corresponding to 2DykBTc ­ 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “n...