Gedik N, Langner M, Orenstein J, Ono S, Abe Yasushi, Ando Yoichi
Physics Department, University of California, Berkeley, Berkeley, California, USA.
Phys Rev Lett. 2005 Sep 9;95(11):117005. doi: 10.1103/PhysRevLett.95.117005.
We report time-resolved measurements of the photoinduced change in reflectivity, DeltaR, in the Bi2Sr2Ca(1-y)Dy(y)Cu2O8+delta (BSCCO) system of cuprate superconductors as a function of hole concentration. We find that the kinetics of quasiparticle decay and the sign of DeltaR both change abruptly where the superconducting transition temperature T(c) is maximal. These coincident changes suggest that a sharp transition in quasiparticle dynamics takes place precisely at optimal doping in the BSCCO system.
我们报告了铜酸盐超导体Bi2Sr2Ca(1 - y)Dy(y)Cu2O8+δ（BSCCO）体系中光致反射率变化ΔR的时间分辨测量结果，该结果是作为空穴浓度的函数。我们发现，在超导转变温度T(c)最大处，准粒子衰变动力学和ΔR的符号都会突然变化。这些同时发生的变化表明，在BSCCO体系中，准粒子动力学的急剧转变恰好发生在最佳掺杂时。
