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Competition between superconductivity and the pseudogap phase in the t – J model
Author(s) -
Zeyher R.,
Greco A.
Publication year - 2003
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.200301675
Subject(s) - pseudogap , condensed matter physics , superconductivity , physics , charge density wave , amplitude , phase (matter) , symmetry (geometry) , order (exchange) , momentum (technical analysis) , spin (aerodynamics) , limit (mathematics) , charge (physics) , raman spectroscopy , quantum mechanics , cuprate , mathematical analysis , geometry , mathematics , finance , economics , thermodynamics
Abstract The t – J model in the large N limit ( N denotes the number of spin components) yields a pseudogap phase in the underdoped region which is related to a d‐wave charge density wave (d‐CDW). We present results for the doping dependence of the superconducting and d‐CDW order parameters as well as for collective excitations in the presence of these two order parameters. We argue that the electronic Raman spectrum with B 1g symmetry probes the amplitude fluctuations of the d‐CDW at zero momentum.