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Pairing-Bag Excitations in Small-Coherence-Length Superconductors

Theoretical Division and Advanced Studies Program in High Temperature Superconductivity Theory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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P. S. Lomdahl

Theoretical Division and Advanced Studies Program in High Temperature Superconductivity Theory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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J. R. Schrieffer

Theoretical Division and Advanced Studies Program in High Temperature Superconductivity Theory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Permanent address: Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106.

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S. A. Trugman

Theoretical Division and Advanced Studies Program in High Temperature Superconductivity Theory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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https://doi.org/10.1142/9789812777041_0054Cited by:0 (Source: Crossref)

Abstract:

Localized baglike solutions in the pairing theory of superconductivity are studied. Starting from the Bogoliubov–de Gennes equations on a two-dimensional square lattice for a half-filled negative-U Hubbard model, cigar- and star-shaped bags are numerically obtained, inside of which the order parameter is reduced, self-consistently trapping an added quasiparticle. These nonlinear excitations are important when the coherence length is small as for the new high-temperature superconductors. Several experimental consequences are discussed.

PACS: 74.65.+n, 74.20.-z, 74.70.Vy

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Pairing-Bag Excitations in Small-Coherence-Length Superconductors

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