Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-11-28
Phys. Rev. B 69, 134507 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, PS, figure included
Scientific paper
10.1103/PhysRevB.69.134507
The point contact spectrum between a normal metal and a superconductor often shows unexpected sharp dips in the conductance at voltage values larger than the superconducting energy gap. These dips are not predicted in the Blonder-Tinkham-Klapwizk (BTK) theory, commonly used to analyse these contacts. We present here a systematic study of these dips in a variety of contacts between different combinations of a superconductor and a normal metal. From the correlation between the characteristics of these dips with the contact area, we can surmise that such dips are caused by the contact not being in the ballistic limit. An analysis of the possible errors introduced while analysing such a spectrum with the standard BTK model is also presented.
Mukhopadhyay Subhadeep
Raychaudhuri Pratap
Sheet Goutam
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