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

O. N. Bychina; A. N. Maljuk; S. Wurmehl; B. Buechner; O. M. Vyaselev

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

Superconductivity 2015-09-10 v1

Authors: O. N. Bychina , A. N. Maljuk , S. Wurmehl , B. Buechner , O. M. Vyaselev

Abstract

A 63Cu NMR study of Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. Temperature dependencies of the NMR peak shift and the nuclear spin-lattice relaxation rate revealed the pseudogap that opens at T* = 20 - 60 K, way above the Tc ~ 9K measured for the orientation (H//c) and value (7 T) of the NMR experiment field. The noticeable discrepancy between Tc and T* and the behavior 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 the studied 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 the upper critical field, unusual for a compound with such low Tc.

Keywords

Pb-doped Bi:2201 Cu NMR pseudogap superconductivity underdoped state upper critical field

Cite

@article{arxiv.1509.02813,
  title  = {Cu NMR study of a Pb-doped Bi:2201 single crystal},
  author = {O. N. Bychina and A. N. Maljuk and S. Wurmehl and B. Buechner and O. M. Vyaselev},
  journal= {arXiv preprint arXiv:1509.02813},
  year   = {2015}
}

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4 pages, 4 figures

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

Abstract

Keywords

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