Abstract
A phase-sensitive time-domain terahertz-transmission spectroscopy was carried out on a c-axis oriented underdoped Bi2Sr2CaCu2O8 + δ thin film. We directly extracted the complex refractive index and conductivity at frequencies from 0.3 to 1.5 THz by numerically solving the observed complex transmittance without Kramers–Kronig analysis. The frequency-resolved real and imaginary part of the conductivity (1.0 THz < f) showed a measurable increase below the characteristic temperature of T* ∼ 210 K because of the appearance of partial phase-coherence with an ultrashort lifetime less than about 1 ps.
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Murakami, H., Tonouchi, M., Uchiyama, T. et al. Ultrafast Phase-Coherence in Normal State of Underdoped Bi2Sr2CaCu2O8 + δ Thin Film. Journal of Superconductivity 15, 345–350 (2002). https://doi.org/10.1023/A:1021066012747
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DOI: https://doi.org/10.1023/A:1021066012747