NMR evidence for a pseudogap in Pb-doped Bi:2201 single crystal

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Abstract

A 63Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin-lattice relaxation (SLR) rate reveal the pseudogap that opens near T* = 60 K, significantly above the superconducting critical temperature Tc ≃ 9 K at the NMR experiment field, 7 T oriented H ∥ c. The noticeable disparity between Tc and T* and the behavior of Cu SLR at T > T* imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (≈7 K) shift of the zero-field Tc0 = 16 ± 1 K under the applied 7 T field suggests high upper critical field, Hc2, unusual for compounds with as low Tc0.

About the authors

O. M Vyaselev

Institute of Solid State Physics, Russian Academy of Sciences

Author for correspondence.
Email: vyasel@issp.ac.ru
Chernogolovka, Russia

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