TY - JOUR

T1 - Symmetry breaking in the tunneling conductance of a superconducting vortex

AU - Leadbeater, M.

AU - Lambert, C. J.

PY - 1996/12/1

Y1 - 1996/12/1

N2 - Recent experiments on c-axis tunneling into a vortex core of YBCO have yielded a sub-gap differential conductance which is not invariant under a reversal of the applied bias. We present a new result for the differential conductance G(E) of a normal-superconducting contact which predicts that whatever the strength of contact, in the absence of open channels in the superconductor, G(E) is necessarily an even function of E and that an asymmetric current-voltage characteristic implies the existence of propagating bound-states within the vortex core. In the tunneling limit, asymmetries arise from the difference between particle and hole densities of states and if the Fermi energy is close to a singularity, is predicted to be sensitive to doping.

AB - Recent experiments on c-axis tunneling into a vortex core of YBCO have yielded a sub-gap differential conductance which is not invariant under a reversal of the applied bias. We present a new result for the differential conductance G(E) of a normal-superconducting contact which predicts that whatever the strength of contact, in the absence of open channels in the superconductor, G(E) is necessarily an even function of E and that an asymmetric current-voltage characteristic implies the existence of propagating bound-states within the vortex core. In the tunneling limit, asymmetries arise from the difference between particle and hole densities of states and if the Fermi energy is close to a singularity, is predicted to be sensitive to doping.

U2 - 10.1007/BF02563013

DO - 10.1007/BF02563013

M3 - Journal article

AN - SCOPUS:77958101352

VL - 46

SP - 1797

EP - 1798

JO - Czechoslovak Journal of Physics

JF - Czechoslovak Journal of Physics

SN - 0011-4626

IS - SUPPL. 3

ER -