Cooper pair and spin fluctuations in underdoped high-temperature superconductors

Dahm T, Manske D, Tewordt L (2001)
EPL (Europhysics Letters) 55(1): 93-99.

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We have calculated the quasiparticle self-energy Sigma (k,omega), spectral function N(k,omega), and density of states N(omega) due to exchange of spin and d-wave pair fluctuations above T-c in the FLEX (fluctuation exchange) approximation. We find that for T --> T-c a pseudogap evolves in N(omega) which is similar to the structure caused by the superconducting d-wave gap below T-c. A satellite peak occurs in N(k,omega) for k near (pi, 0) which is caused by a peak in -Im Sigma (k,omega). Since these effects become relatively weak at higher temperatures T similar or equal to 2T(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-c in underdoped cuprates.
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Dahm T, Manske D, Tewordt L. Cooper pair and spin fluctuations in underdoped high-temperature superconductors. EPL (Europhysics Letters). 2001;55(1):93-99.
Dahm, T., Manske, D., & Tewordt, L. (2001). Cooper pair and spin fluctuations in underdoped high-temperature superconductors. EPL (Europhysics Letters), 55(1), 93-99.
Dahm, T., Manske, D., and Tewordt, L. (2001). Cooper pair and spin fluctuations in underdoped high-temperature superconductors. EPL (Europhysics Letters) 55, 93-99.
Dahm, T., Manske, D., & Tewordt, L., 2001. Cooper pair and spin fluctuations in underdoped high-temperature superconductors. EPL (Europhysics Letters), 55(1), p 93-99.
T. Dahm, D. Manske, and L. Tewordt, “Cooper pair and spin fluctuations in underdoped high-temperature superconductors”, EPL (Europhysics Letters), vol. 55, 2001, pp. 93-99.
Dahm, T., Manske, D., Tewordt, L.: Cooper pair and spin fluctuations in underdoped high-temperature superconductors. EPL (Europhysics Letters). 55, 93-99 (2001).
Dahm, Thomas, Manske, D, and Tewordt, L. “Cooper pair and spin fluctuations in underdoped high-temperature superconductors”. EPL (Europhysics Letters) 55.1 (2001): 93-99.
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