A lead NMR-study of the superconductor Pb2Sr0.9La1.1Cu2O6.1

✍ Scribed by F.J.M. Benschop; H.B. Brom; W.J.A. Maaskant

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 748 KB
• Volume: 201
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90111-o

✦ Synopsis

Pb2Sr0.9LaHCu2Or.l is one of the few high-To superconductors with a CuO2-monolayer. Here we report the 2°7pb-NMR measurements of the Knight shift and the nuclear spin-lattice and spin-spin relaxation rate on a powder sample with a To= 33 K. As in YBa2Cu3Or.63, the Knight shift, as a function of temperature, starts to decrease below T~ 3To. The spin-lattice relaxation rate can be modelled quantitatively with the MMP theory. The lead oxide layers in the title compound contribute clearly to the metallic nature of the CuO2-1ayers. With respect to the quasi particle contributions, the antiferromagnetic correlations are of less importance to the spin-lattice relaxation in the lead cuprate as compared to e.g. YBa2Cu306+~ and La1.ssSro.15CuO4. The relative contribution of the antiferromagnetic part to the static susceptibility is about 3% (fl=0.5), while the antiferromagnetic correlation lengths extracted from the MMP theory are comparable to those of Lat.ssSro.15CuO4.