Volume 55, Number 1, July 2001
|Page(s)||93 - 99|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Cooper pair and spin fluctuations in underdoped high-temperature superconductors
Universität Tübingen, Institut für Theoretische Physik
Auf der Morgenstelle 14, 72076 Tübingen, Germany
2 Freie Universität Berlin, Institut für Theoretische Physik Arnimallee 14, 14195 Berlin, Germany
3 Universität Hamburg, I. Institut für Theoretische Physik Jungiusstr. 9, 20355 Hamburg, Germany
Accepted: 19 April 2001
We have calculated the quasiparticle self-energy , spectral function , and density of states due to exchange of spin and d-wave pair fluctuations above in the FLEX (fluctuation exchange) approximation. We find that for a pseudogap evolves in which is similar to the structure caused by the superconducting d-wave gap below . A satellite peak occurs in for near which is caused by a peak in . Since these effects become relatively weak at higher temperatures , however, we have to conclude that fluctuations of the pair amplitude within this spin fluctuation pairing scenario cannot explain the observed pseudogap behavior well above in underdoped cuprates.
PACS: 74.72.-h – High- compounds / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 2001
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