Theory of pairing symmetry in the vortex states

Yokoyama, Takehito and Ichioka, Yukio and Yanaka, Yukio and Golubov, Alexander (2010) Theory of pairing symmetry in the vortex states. Physica C: Superconductivity, 470 (19). pp. 766-770. ISSN 0921-4534

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Abstract:	We investigate pairing symmetry in an Abrikosov vortex and vortex lattice. It is shown that the Cooper pair wave function at the center of an Abrikosov vortex with vorticity m has a different parity with respect to frequency from that in the bulk if m is an odd number, while it has the same parity if m is an even number. As a result, in a conventional vortex with m = 1, the local density of states at the Fermi energy has a maximum (minimum) at the center of the vortex core in an even (odd)-frequency superconductor. In the vortex lattice of s-wave superconductor, we find that only odd-frequency pairing is present at the core centers, while at the midpoint of the vortex lines, only even-frequency pairing exists. Thus, the odd and even-frequency pairings also form the lattice in the vortex lattice state. We also propose a scanning tunneling microscope experiment using a superconducting tip to explore odd-frequency superconductivity.
Item Type:	Article
Copyright:	© 2010 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Interfaces and Correlated Electron Systems (ICE)
Link to this item:	http://purl.utwente.nl/publications/80280
Official URL:	http://dx.doi.org/10.1016/j.physc.2010.02.084
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