Phys. Rev. Lett. 62, 1691–1693 (1989)Zero-bias tunneling anomaly at a vortex coreReceived 8 February 1989; published in the issue dated 3 April 1989 The sharp peak in the tunneling conductance at a vortex core, reported by Hess et al. in NbSe2, is attributed to self-energy corrections of the normal electrons (in the core) caused by their coupling to excitations of the superconducting region (outside the core). The shape of the zero-bias anomaly is reproduced without benefit from adjustable parameters, though the predicted size is a little too large. If the critical currents in the superconducting region (outside the core) are recognized by letting the excitation density (at zero energy) be finite, then a perfect fit can be obtained. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.1691
DOI:
10.1103/PhysRevLett.62.1691
PACS:
74.20.Fg, 74.50.+r, 74.60.-w
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