Midgap edge states and pairing symmetry of quasi-one-dimensional organic superconductors

Details Midgap edge states and pairing symmetry of quasi-one-dimensional organic superconductors Midgap edge states and pairing symmetry of quasi-one-dimensional organic superconductors

2000-10-16

arxiv.org/abs/cond-mat/0010206v3

Phys. Rev. B 63, 144531 (2001)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures. V.2: New section on spin response is added and references are updated. V.3: Final version accepted to PRB.

Scientific paper

10.1103/PhysRevB.63.144531

The singlet s-, d- and triplet p-wave pairing symmetries in quasi-one-dimensional organic superconductors can be experimentally discriminated by probing the Andreev bound states at the sample edges. These states have the energy in the middle of the superconducting gap and manifest themselves as a zero-bias peak in tunneling conductance into the corresponding edge. Their existence is related to the sign change of the pairing potential around the Fermi surface. We present an exact self-consistent solution of the edge problem showing the presence of the midgap states for p_x-wave superconductivity. The spins of the edge state respond paramagnetically to a magnetic field parallel to the vector d that characterizes triplet pairing.

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