Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates

Dahm T, Manske D, Tewordt L (1997)
Physical Review B 55(22): 15274-15281.

Journal Article | Published | English

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We calculate self-consistently the spin and d(x2-y2)-wave order-parameter fluctuations (OPFL's) above T-c within an extension of the FLEX (fluctuation exchange approximation for the two-dimensional Hubbard model. The quasiparticle interaction due to OPFL's can compete with that due to spin fluctuations for temperatures near T-c and short pairing correlation lengths like those in the cuprates. The coupling of these fluctuations via self-energy renormalization leads to a suppression of T-c and to a decrease of the dynamical spin susceptibility for decreasing T below a crossover temperature T* > T-c. The temperature T* increases while T-c decreases with increasing strength of OPFL`s or decreasing doping. The resulting neutron-scattering intensity and NMR relaxation rates 1/T-1 and 1/T-2G decrease below T* for decreasing T. This agrees qualitatively with the observed spin gap behavior in the underdoped high-T-c cuprates.
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Dahm T, Manske D, Tewordt L. Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates. Physical Review B. 1997;55(22):15274-15281.
Dahm, T., Manske, D., & Tewordt, L. (1997). Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates. Physical Review B, 55(22), 15274-15281.
Dahm, T., Manske, D., and Tewordt, L. (1997). Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates. Physical Review B 55, 15274-15281.
Dahm, T., Manske, D., & Tewordt, L., 1997. Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates. Physical Review B, 55(22), p 15274-15281.
T. Dahm, D. Manske, and L. Tewordt, “Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates”, Physical Review B, vol. 55, 1997, pp. 15274-15281.
Dahm, T., Manske, D., Tewordt, L.: Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates. Physical Review B. 55, 15274-15281 (1997).
Dahm, Thomas, Manske, D, and Tewordt, L. “Coupling of order parameter and spin fluctuations in underdoped high-T-c cuprates”. Physical Review B 55.22 (1997): 15274-15281.
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