ISSN:
1572-9605
Keywords:
d-wave superconductivity
;
generalized Hubbard model
;
two-hole bound states
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract A $${\text{d}}_{x^2 - y^2 } $$ superconducting ground state has been obtained within a two-dimensional (2D) generalized Hubbard model, in which a next-nearest-neighbor correlated-hopping interaction is included. In spite of its smaller strength in comparison with other terms of the model, we found its key participation in the d-channel hole pairing. The hole singlet ground-state phase diagram shows a large d-symmetry pairing region that is enhanced by the on-site repulsive Coulomb interaction. For finite density of holes (n h), the mean-field BCS theory is applied to the model. The results show a maximum d-wave critical temperature (T c) around n h = 0.35, and this T c is favored by the presence of an antiferromagnetic background.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026489922073
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