Absence of a Loss of In-Plane Infrared Spectral Weight in the Pseudogap Regime of Bi2Sr2CaCu2O81d
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چکیده
The ab-plane reflectance of Bi2Sr2CaCu2O81d (Bi-2212) thin films was measured in the 30 25 000 cm21 range for one underdoped (Tc 70 K), and one overdoped sample (Tc 63 K) down to 10 K. We find 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 in the k 0,p direction and of the in-plane infrared conductivity being mostly sensitive to the k p,p direction.
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تاریخ انتشار 2002