Cooper pair and spin fluctuations in underdoped high-temperature superconductors

T. Dahm; D. Manske; L. Tewordt

doi:10.1209/epl/i2001-00386-y

All issues

Volume 55 / No 1 (July 2001)

Europhys. Lett., 55 1 (2001) 93-99

Abstract

Issue		Europhys. Lett. Volume 55, Number 1, July 2001


Page(s)		93 - 99
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2001-00386-y
Published online		01 December 2003

Europhys. Lett., 55 (1), pp. 93-99 (2001)

Cooper pair and spin fluctuations in underdoped high-temperature superconductors

T. Dahm¹, D. Manske² and L. Tewordt³

¹ 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

Received: 16 October 2000
Accepted: 19 April 2001

Abstract

We have calculated the quasiparticle self-energy $\Sigma({\bm k},\omega)$ , spectral function $N({\bm k},\omega)$ , and density of states $N(\omega)$ due to exchange of spin and d-wave pair fluctuations above $T_\ab{c}$ in the FLEX (fluctuation exchange) approximation. We find that for $T \to T_\ab{c}$ a pseudogap evolves in $N(\omega)$ which is similar to the structure caused by the superconducting d-wave gap below $T_\ab{c}$ . A satellite peak occurs in $N({\bm k},\omega)$ for ${\bm k}$ near $(\pi,0)$ which is caused by a peak in $-{Im }\Sigma({\bm k},\omega)$ . Since these effects become relatively weak at higher temperatures $T \simeq 2T_\ab{c}$ , 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 $T_\ab{c}$ in underdoped cuprates.

PACS: 74.72.-h – High- $T_\ab{c}$ 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.)

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