Persistent currents in a superconducting ring with a normal and spin-flip junction

We study the persistent currents in a one-dimensional ring with a junction, described by the negative- U Hubbard model using exact diagonalization methods. The hopping in the junction has two terms: a direct hopping t′ and a hopping J through a magnetic impurity. For sufficiently large values of J t...

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Bibliographic Details
Published in:Solid state communications 1995, Vol.93 (2), p.119-122
Main Authors: Jagla, E.A., Balseiro, C.A.
Format: Article
Language:English
Subjects:
Classical spin models
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
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Summary:We study the persistent currents in a one-dimensional ring with a junction, described by the negative- U Hubbard model using exact diagonalization methods. The hopping in the junction has two terms: a direct hopping t′ and a hopping J through a magnetic impurity. For sufficiently large values of J t′ the persistent current changes sign, giving rise to what is known as a π-junction. For high values of J and t′ non-linear effects are observed.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(94)00740-3