136 research outputs found
Nonconstant electronic density of states tunneling inversion for A15 superconductors: Nb3Sn
We re-examine the tunneling data on A15 superconductors by performing a
generalized McMillan-Rowell tunneling inversion that incorporates a nonconstant
electronic density of states obtained from band-structure calculations. For
Nb3Sn, we find that the fit to the experimental data can be slightly improved
by taking into account the sharp structure in the density of states, but it is
likely that such an analysis alone is not enough to completely explain the
superconducting tunneling characteristics of this material. Nevertheless, the
extracted Eliashberg function displays a number of features expected to be
present for the highest quality Nb3Sn samples.Comment: 11 pages, 11 figure
Study of the defect structures in irradiated Al- and NbC-single crystals by the channeling technique
Point Contact Spectroscopy of Nb3Sn Crystals: Evidence of a CDW Gap Related to the Martensitic Transition
Two Single crystals of Nb3Sn presenting the martensitic anomaly at different
temperature and shape, as observed with specific heat measurements, were used
to study structural features in the electronic density of states with point
contact spectroscopy. At high temperature below the martensitic anomaly, we
observed different spectroscopic characteristics. One sample displaying a well
marked specific heat peak, shows a clear defined structure in the differential
conductance that evolves with temperature and may be associated with changes on
the density of states due to the opening of a charge density wave gap. Those
features are very depending on the crystallographics characteristics of the
single crystal examined.Comment: 13 pages 6 figures. accepted in Solid State Communicatio
Theory of tunneling spectroscopy in superconducting Sr2RuO4
A theory for tunneling spectroscopy in normal metal /insulator/triplet
superconductor junction is presented. We assume two kinds of non-unitary
triplet superconducting states which are the most promising states for
SrRuO. The calculated conductance spectra showzero-bias peaks as
well as gap structures. The existences of residual components in the spectra
reflect the non-unitary properties of superconducting states.Comment: 5pages, 4figures(included), to be published in Phys.Rev.B 56, (1997
Modification of the superconducting and structural properties of the ion implanted and ion irradiated transition metals and transition metal compounds
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