Enviar artigo por via de e-mail NMR evidence for a pseudogap in Pb-doped Bi:2201 single crystal
- Autores: Vyaselev O.M1
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Afiliações:
- Institute of Solid State Physics, Russian Academy of Sciences
- Edição: Volume 122, Nº 1-2 (2025)
- Páginas: 100-102
- Seção: Articles
- URL: https://journal-vniispk.ru/0370-274X/article/view/326490
- DOI: https://doi.org/10.31857/S0370274X25070144
- EDN: https://elibrary.ru/KIYIUK
- ID: 326490
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Resumo
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.
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Sobre autores
O. Vyaselev
Institute of Solid State Physics, Russian Academy of Sciences
Autor responsável pela correspondência
Email: vyasel@issp.ac.ru
Chernogolovka, Russia
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