Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system

Details Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system Abrupt transition in quasiparticle dynamics at optimal doping in a cuprate superconductor system

2005-03-15

arxiv.org/abs/cond-mat/0503355v1

Phys. Rev. Lett. 95, 117005 (2005)

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.117005

We report time-resolved measurements of the photoinduced change in reflectivity, Delta R, in the Bi2Sr2Ca(1-y)Dy(y)Cu2O(8+delta) (BSCCO) system of cuprate superconductors as a function of hole concentration. We find that the kinetics of quasiparticle decay and the sign of Delta R both change abruptly where the superconducting transition temperature Tc is maximal. These coincident changes suggest that a sharp transition in quasiparticle dynamics takes place precisely at optimal doping in the BSCCO system.

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