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A 63Cu NMR study of Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, ispresented. Temperature dependencies of the NMR peak shift and the nuclearspin-lattice relaxation rate revealed the pseudogap that opens at T* = 20 - 60K, way above the Tc ~ 9K measured for the orientation (H//c) and value (7 T) ofthe NMR experiment field. The noticeable discrepancy between Tc and T* and thebehavior of Cu SLR at T > T* imply the underdoped state of the studied system.The magnetic field has a relatively weak effect on the superconductivity in thestudied system, as evidenced from small (7-8 K) shift of the zero-field Tc =16+/- 1K under the applied 7 T field. This fact suggests a high value of theupper critical field, unusual for a compound with such low Tc.

Cu NMR study of a Pb-doped Bi:2201 single crystal