H. Ding, M. Norman, John Giapintzakis, Juan Campuzano, H. Claus, H. Wuehl, M. Randeria, A. Bellman, T. Yokoya, Takashi Takahashi, Takashi Mochiku, Kazuo Kadowaki, Don Ginsberg
Using high resolution angle-resolved photoemission spectroscopy (ARPES), we measure the superconducting gap and its momentum dependence in the high temperature superconductors Bi2Sr2CaCu2O8 (Bi2212) and YBa2Cu3O6.95 (Y123). It is found that umklapp bands due to the incommensurate superlattice in Bi2212 may obscure the intrinsic momentum dependence of the gap. By taking these into consideration, we find a d- wave-like gap function in Bi2212. We also report an unambiguous observation of the superconducting gap in Y123.
(2223)2/(2234)2 superlattices have been synthesized by three target sequential sputter deposition of BiO, SrCu0.5O1.5 and CaCuO2 layers. The superstructure formed was analyzed in atomic layer scale by using some X-ray diffraction technique, such as interference of X-ray specular reflection, observation of the Laue's function pattern and a quantitative analysis of intergrowth. The superlattice, thus confirmed in the atomic layer scale, has a superconducting transition temperature (Tc) as high as the average of monophasic 2223 and 2234 films. The resistivity showed a similar angular dependence on the magnetic field orientation even at the temperature higher than the Tc of 2234. These results will be discussed by the hole diffusion and/or the proximity effect between the 2223 and 2234 layers.
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