Density of states, nuclear relaxation rate, and thermal conductivity in high-Tc superconductors

S. Wermbter; L. Tewordt

doi:10.1103/PhysRevB.44.9524

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Density of states, nuclear relaxation rate, and thermal conductivity in high-Tc superconductors

S. Wermbter, L. Tewordt

DOI 10.1103/PhysRevB.44.9524 · Physical Review B

T1

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Abstract

We solve the Eliashberg equations for the self-energy of quasiparticles in a two-dimensional band, interacting via exchange of phonons and antiparamagnons. The interaction due to exchange of spin and charge fluctuations is calculated self-consistently within the random-phase approximation for the Hubbard model. The pair breaking caused by spin fluctuations leads to a gapless density of states near Tc, to a rapid drop of the nuclear-spin-lattice relaxation rate below Tc, and to a gradual upturn of the phonon thermal conductivity below Tc. In the superconducting state there occurs a pseudogap in the dynamical structure factor for neutron scattering. Our results are in qualitative agreement with the experimental data on YBa2Cu3O7.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown