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29 March 2024
 
  » arxiv » cond-mat/0107161

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Absence of a pseudogap in the in-plane infrared response of Bi2Sr2CaCu2O(8+d)
A.F. Santander-Syro ; R.P.S.M. Lobo ; N. Bontemps ; Z. Konstantinovic ; Z.Z. Li ; H. Raffy ;
Date 9 Jul 2001
Journal Phys. Rev. Lett. 88, 097005 (2002)
Subject Superconductivity | cond-mat.supr-con
AbstractThe ab-plane reflectance of Bi2Sr2CaCu2O(8+d) thin films was measured in the 30-25000 cm^(-1) range for one underdoped (Tc = 70 K), and one overdoped sample (Tc = 63 K) as a function of temperature (10-300 K). We find qualitatively similar behaviors in the temperature dependence of the normal-state infrared response of both samples. Above Tc, the effective spectral weight, obtained from the integrated conductivity, does not decrease when T decreases, so that no opening of an optical pseudogap is seen. We suggest that these are consequences of the pseudogap opening first in the k=(0, pi) direction, according to ARPES, and of the in-plane infrared conductivity being mostly sensitive to the k=(pi, pi) direction.
Source arXiv, cond-mat/0107161
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