%0 Book Section %1 statphys23_0543 %A Dukan, S. %A Tenenbaum, J. %A Porembski, J. %A Tata, K. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K conductance differential disorder non-magnetic statphys23 superconductivity topic-8 %T Low-Temperature Differential Conductance of an Extreme Type-II Superconductor at High Magnetic Fields %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=543 %X The tunneling conductance between a Scanning Tunneling Microscope (STM) tip and a surface of an extreme type-II superconductor separated by a thin insulating layer in a high magnetic field and at zero temperatures is calculated. In a clean system and with electrons tunneling only along vortex lines we find that when the STM tip is placed at the position of a vortex, the differential conductance $(V)$ has an algebraic dependence on the bias voltage $V$ reflecting the presence of gapless points in the quasiparticle excitation spectrum of a superconductor in high magnetic fields. When non-magnetic impurities are introduced into the system, the differential conductance at zero bias voltage becomes finite, indicating the broadening of the gapless or near gapless regions in the quasiparticle excitation spectrum at high fields. Within T-matrix approximation the differential conductance $\sigma(V)$ is calculated in both weak- and strong-scattering limit for wide range of magnetic field strengths $H0.2H_c2$ in the mixed state.

@incollection{statphys23_0543, abstract = {The tunneling conductance between a Scanning Tunneling Microscope (STM) tip and a surface of an extreme type-II superconductor separated by a thin insulating layer in a high magnetic field and at zero temperatures is calculated. In a clean system and with electrons tunneling only along vortex lines we find that when the STM tip is placed at the position of a vortex, the differential conductance $\sigma (V)$ has an algebraic dependence on the bias voltage $V$ reflecting the presence of gapless points in the quasiparticle excitation spectrum of a superconductor in high magnetic fields. When non-magnetic impurities are introduced into the system, the differential conductance at zero bias voltage becomes finite, indicating the broadening of the gapless or near gapless regions in the quasiparticle excitation spectrum at high fields. Within T-matrix approximation the differential conductance $\sigma(V)$ is calculated in both weak- and strong-scattering limit for wide range of magnetic field strengths $H\geq 0.2H_{c2}$ in the mixed state.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Dukan, S. and Tenenbaum, J. and Porembski, J. and Tata, K.}, biburl = {https://www.bibsonomy.org/bibtex/2ec02c74ce43665d9fa9caa0a12b1095a/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {04ba2b07e9a4b927f2fafdf10f172f58}, intrahash = {ec02c74ce43665d9fa9caa0a12b1095a}, keywords = {conductance differential disorder non-magnetic statphys23 superconductivity topic-8}, month = {9-13 July}, timestamp = {2007-06-20T10:16:23.000+0200}, title = {Low-Temperature Differential Conductance of an Extreme Type-II Superconductor at High Magnetic Fields}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=543}, year = 2007 }