Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

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...

Evidence of gap anisotropy in superconducting YNi2B2C using directional point-contact spectroscopy.

We present a study of the anisotropy in the superconducting energy gap in a single crystal of YNi2B2C (T(c) approximately 14.6 K) using directional point-contact spectroscopy. The superconducting energy gap at 2.7 K, when measured for I||c, is 4.5 times larger than that for I||a. The energy gaps in the two directions also have different temperature dependences. Our results support a scenario wi...

Evidence for two superconducting energy gaps in MgB(2) by point-contact spectroscopy.

Experimental support is found for the multiband model of the superconductivity in the recently discovered system MgB(2) with the transition temperature T(c) = 39 K. By means of Andreev reflection, evidence is obtained for two distinct superconducting energy gaps. The sizes of the two gaps ( Delta(S) = 2.8 meV and Delta(L) = 7 meV) are, respectively, smaller and larger than the expected weak cou...

Anisotropy of Energy Gap in Superconducting Aluminum

Point-contact Spectroscopy of Superconductors