Analysis of characteristic temperatures in high-T{sub c} systems

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.R509· OSTI ID:531842

Schmalian, J; Grabowski, S; Bennemann, K H ^[1]

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1. Institut fuer Theoretische Physik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin (Germany)

Using a self-consistent diagrammatic theory of the one-band Hubbard model, we find that three characteristic temperatures T{sup {asterisk}}, T{sub c}{sup {asterisk}}, and T{sub c} may characterize the behavior of high-T{sub c} superconductors. The temperature T{sup {asterisk}} defines the onset of a pseudogap in the density of states and of anomalous normal-state behavior. At T{sub c}{sup {asterisk}} local mean-field-like Cooper-pair formation begins with T{sub c}{sup {asterisk}}{lt}T{sup {asterisk}}. Due to phase fluctuations of the order parameter, global spin-fluctuation-induced d{sub x{sup 2}{minus}y{sup 2}}-wave superconductivity occurs only at T{sub c} below T{sub c}{sup {asterisk}}. The suppression of T{sub c}{sup {asterisk}}{r_arrow}T{sub c} is strong for underdoped systems yielding an optimal doping where T{sub c} is largest. The doping dependence of the penetration depth and the influence of Cooper pairing and antiferromagnetic short-range correlations on photoemission experiments are discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531842
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
COOPER PAIRS
CRITICAL TEMPERATURE
ENERGY GAP
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
PENETRATION DEPTH
PHOTOEMISSION
SPIN WAVES
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE