Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 3: Correlated Electrons - Heavy Fermions
TT 3.11: Vortrag
Freitag, 4. März 2005, 12:45–13:00, TU H3027
Fluctuation conductivity of thin films and nanowires near a parallel-field-tuned superconducting quantum phase transition — •Nayana Shah1, Andrei Lopatin2, and Valerii Vinokur2 — 1Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Germany — 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
We calculate the fluctuation correction to the normal state conductivity in the vicinity of a quantum phase transition from a superconducting to normal state, induced by applying a magnetic field parallel to a dirty thin film or a nanowire with thickness smaller than the superconducting coherence length. We find that at zero temperature, where the correction comes purely from quantum fluctuations, the positive Aslamazov-Larkin contribution, the negative density of states contribution, and the Maki-Thompson interference contribution, are all of the same order and the total correction is negative. Further we show that based on how the quantum critical point is approached, there are three regimes that show different temperature and field dependencies which should be experimentally accessible.