Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-22
New Journal of Physics 11, 075005 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1088/1367-2630/11/7/075005
Supercurrents in superconducting flux threaded loops are expected to oscillate with the magnetic flux with a period of hc/2e. This is indeed true for s-wave superconductors larger than the coherence length xi_0. Here we show that for superconductors with gap nodes, there is no such strict condition for the supercurrent to be hc/2e rather than hc/e periodic. For nodal superconductors, the flux induced Doppler shift of the near nodal states leads to a flux dependent occupation probability of quasi-particles circulating clockwise and counter clockwise around the loop, which leads to an hc/e periodic component of the supercurrent, even at zero temperature. We analyze this phenomenon on a cylinder in an approximative analytic approach and also numerically within the framework of the BCS theory. Specifically for d-wave pairing, we show that the hc/e periodic current component decreases with the inverse radius of the loop and investigate its temperature dependence.
Kampf Arno P.
Kopp Thilo
Loder Florian
Mannhart Jochen
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