Physics – Condensed Matter – Superconductivity
Scientific paper
2008-02-21
Phys. Rev. Lett. 101 (2008) 137003
Physics
Condensed Matter
Superconductivity
4 figures. One report on the ultrast dynamics of quasiparticles in underdoped Bi2Sr2CaCu2O8
Scientific paper
10.1103/PhysRevLett.101.137003
We report the ultra-fast optical response of quasi-particles (QPs) in both the pseudogap (PG) and superconducting (SC) states of underdoped (UD) Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212) single crystal measured with the time-resolved pump-probe technique. At a probe energy $\hbar\omega_{pr}$=1.55 eV, it is found that the reflectivity change $\Delta$R/R changes its sign at exactly $T_{c}$, which allows the direct separation of the charge dynamics of PG and SC QPs. Further systematic investigations indicate that the transient signals associated with PG and SC QPs depend on the probe beam energy and polarization. By tuning them below $T_{c}$ two distinct components can be detected simultaneously, providing evidence for the coexistence of PG and SC QPs.
Ido M.
Liu Yi-Hsin
Momono N.
Oda Masuho
Shimatake K.
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