Influence of oxygen ordering kinetics on Raman and optical response in YBa_2Cu_3O_{6.4}

Details Influence of oxygen ordering kinetics on Raman and optical response in YBa_2Cu_3O_{6.4} Influence of oxygen ordering kinetics on Raman and optical response in YBa_2Cu_3O_{6.4}

1995-11-15

arxiv.org/abs/cond-mat/9511071v1

Physics

Condensed Matter

REVTeX, 3 pages + 4 PostScript (compressed) figures

Scientific paper

10.1103/PhysRevB.54.R6901

Kinetics of the optical and Raman response in YBa_2Cu_3O_{6.4} were studied during room temperature annealing following heat treatment. The superconducting T_c, dc resistivity, and low-energy optical conductivity recover slowly, implying a long relaxation time for the carrier density. Short relaxation times are observed for the B_{1g} Raman scattering -- magnetic, continuum, and phonon -- and the charge transfer band. Monte Carlo simulations suggest that these two relaxation rates are related to two length scales corresponding to local oxygen ordering (fast) and long chain and twin formation (slow).

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