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D charge‐density‐wave versus superconducting phase fluctuations in underdoped high‐ T c superconductors
Author(s) -
Zeyher R.,
Greco A.
Publication year - 2005
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.200460036
Subject(s) - superconductivity , condensed matter physics , charge density wave , phase diagram , quantum tunnelling , physics , charge (physics) , phase (matter) , doping , density of states , superconducting transition temperature , transition temperature , scanning tunneling microscope , quantum mechanics
The underdoped region in high‐ T c superconductors is characterized by an increase of the d ‐wave gap and a decrease of the superconducting transition temperature T c with decreasing doping. Two effects may cause such a behavior in the t – J model. On the one hand, superconductivity competes and may also coexist with a d charge‐density‐wave state. We discuss this effect by studying the phase diagram of the t – J model at large N ( N is the number of internal degrees of freedom), the gap structure in the coexisting region and the resulting c ‐axis tunneling spectra. On the other hand, we give rather general arguments in favor of a strong reduction of the phase stiffness near a Mott transition and calculate the resulting drop in T c at low dopings due to thermal phase fluctuations. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)