Coupling of order parameter and spin fluctuations in underdoped high-T{sub c} cuprates
- Abteilung fuer Theoretische Festkoerperphysik, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg (Germany)
We calculate self-consistently the spin and d{sub x{sup 2}{minus}y{sup 2}}-wave order-parameter fluctuations (OPFL{close_quote}s) above T{sub c} within an extension of the FLEX (fluctuation exchange) approximation for the two-dimensional Hubbard model. The quasiparticle interaction due to OPFL{close_quote}s can compete with that due to spin fluctuations for temperatures near T{sub 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{sub c} and to a decrease of the dynamical spin susceptibility for decreasing T below a crossover temperature T{sub {asterisk}}{gt}T{sub c}. The temperature T{sub {asterisk}} increases while T{sub c} decreases with increasing strength of OPFL{close_quote}s or decreasing doping. The resulting neutron-scattering intensity and NMR relaxation rates 1/T{sub 1} and 1/T{sub 2G} decrease below T{sub {asterisk}} for decreasing T. This agrees qualitatively with the observed spin gap behavior in the underdoped high-T{sub c} cuprates. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 530178
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of normal-state pseudogap on physical quantities in Hubbard model for underdoped high-{Tc} cuprates
Massless Dirac Fermions, Gauge Fields, and Underdoped Cuprates