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Half‐filled stripes in the t – t ′– U Hubbard model
Author(s) -
Raczkowski Marcin,
Oleś Andrzej M.,
Frésard Raymond
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200562403
Subject(s) - antiferromagnetism , hubbard model , condensed matter physics , physics , kinetic energy , t j model , order (exchange) , k nearest neighbors algorithm , quantum mechanics , superconductivity , finance , artificial intelligence , computer science , economics
Using a self‐consistent Hartree‐Fock approximation we investigate the relative stability of various stripe phases in the extended t – t ′– U Hubbard model. One finds that a negative ratio of next‐ to nearest‐neighbor hopping t ′/ t < 0 expells holes from antiferromagnetic domains and reinforces the stripe order. Therefore the half‐filled stripes not only accommodate holes but also redistribute them so that the kinetic energy is gained, and these stripes take over in the regime of t ′/ t ≃ –0.3 appropriate for YBa 2 Cu 3 O 6+ δ . (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)