Electronic Resource
Springer
Journal of low temperature physics
105 (1996), S. 615-620
ISSN:
1573-7357
Keywords:
74.20.Mn
;
74.72.−h
;
74.25.Jb
;
71.27.+a
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The spectrum of the 2D t-J model is shown to change drastically due to transitions from the long-range to short-range antiferromagnetic order at the hole concentration x ≈ 0.04 and from the short-range order to a completely disordered paramagnetic state at x ≈ 0.19. In the region 0.04 ≲ x ≲ 0.19 the obtained shape of the Fermi surface, the hole dispersion near the Fermi level, and the density of states on it are in satisfactory agreement with experiment in Bi2212. Based on the obtained spectral functions the Eliashberg formalism is used for calculating Tc. The hole-magnon interaction alone is found to be unable to give rise to superconductivity. By adding a moderate interaction with apex oxygen vibrations high Tc are obtained for even frequency $$d_{x^2 - y^2 }$$ pairing in the range 0.04 ≲ x ≲ 0.17. For larger hole concentrations the odd frequency s-wave solution becomes the leading one which can result in s-wave superconductivity in the overdoped regime with the participation of a hole-phonon interaction of the respective symmetry.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00768452
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