Abstract
We report a microscopic investigation of carrier relaxation dynamics in YBa 2Cu 3O 7−δ. Electrons are excited out of equilibrium by 1.5 picosecond laser pulses and their subsequent collisions with the lattice are investigated by counting — with the use of Stokes anti-Stokes Raman scattering — the resulting non-equilibrium occupation numbers for different lattice vibrations. The photoexcitation intensity is varied such that the system is driven through the Anderson transition. The electron-phonon scattering rate for both planar and out-of-plane phonons is seen to decrease in the metallic state, the change being coincident with changes in dielectric constant and conductivity reported by Yu et al (Phys.Rev. B 45, 4964, (1991)). The temperature dependence of carrier-lattice interaction rather unambiguously implies Fermi-glass carrier relaxation dynamics where carriers relax by hopping between localized states.
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