The local spectrum of a superconductor as a probe of interactions between magnetic impurities

Details The local spectrum of a superconductor as a probe of interactions between magnetic impurities The local spectrum of a superconductor as a probe of interactions between magnetic impurities

1999-12-10

arxiv.org/abs/cond-mat/9912195v1

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures

Scientific paper

10.1103/PhysRevB.61.14810

Qualitative differences in the spectrum of a superconductor near magnetic impurity pairs with moments aligned parallel and antiparallel are derived. A proposal is made for a new, nonmagnetic scanning tunneling spectroscopy of magnetic impurity interactions based on these differences. Near parallel impurity pairs the mid-gap localized spin-polarized states associated with each impurity hybridize and form bonding and anti-bonding molecular states with different energies. For antiparallel impurity moments the states do not hybridize; they are degenerate.

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