Direct Observation of the Coexistence of the Pseudogap and Superconducting Quasiparticles in Bi2Sr2CaCu2O8+y by Time-Resolved Optical Spectroscopy
Y. H. Liu, Y. Toda, K. Shimatake, N. Momono, M. Oda, M. Ido
DOI 10.1103/PhysRevLett.101.137003 · Physical Review Letters
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Abstract
We report the ultrafast optical response of quasiparticles (QPs) in both the pseudogap (PG) and superconducting (SC) states of an underdoped Bi2Sr2CaCu2O8+y (Bi2212) single crystal measured with the time-resolved pump-probe technique. At a probe energy ℏωpr=1.55 eV, it is found that the reflectivity change ΔR/R changes its sign at exactly Tc, 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 Tc, two distinct components can be detected simultaneously, providing evidence for the coexistence of PG and SC QPs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76 | Pressure not reported | onset |
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