Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.37: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Impact of the transport supercurrent on the zero-bias conductance peak — •Sergei Shevchenko and Alexander Omelyanchouk — Institute for Low Temp. Phys. and Eng., Lenin Ave. 47, 61108 Kharkov, Ukraine.

The impact of the supercurrent on the density of states in superconducting structures is investigated. Namely two situations were studied: (i) of a film containing a weak link and (ii) a film of a d-wave superconductor. In Ref. [1] we have shown that in the situation when the transport supercurrent flows in the region of suppressed order parameter (in the vicinity of the weak link as in the case (i) or at the boundary of a d-wave superconductor, case (ii)) the quasiparticles create the countercurrent. In this work we show that these quasiparticles are responsible for the appearance of the zero-bias conductance peak. Particularly we investigate the impact of the transport supercurrent flowing in parallel to the boundary on the conductance of the SIN-structure and discuss its observability with the scanning tunneling spectroscopy, as in Ref. [2]. We also discuss the relation of our results to the experiment, presenting alternative explanation of the experimental results of Ref. [2].

[1] Yu.A. Kolesnichenko, A.N. Omelyanchouk, and S.N. Shevchenko, Phys. Rev. B 67, 172504 (2003); Low Temp. Phys. 30, 213 (2004). [2] J. Ngai, P. Morales, and J.Y.T. Wei, Phys. Rev. B 72, 054513 (2005).