NMR study of high-TC superconductors

K. Asayama, Y. Kitaoka, G. Q. Zheng, K. Ishida, K. Magishi

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Abstract

Recent NMR study of high-TC superconductors carried out by Osaka group is reviewed. NQR frequency vQ, Knight shift K, T1 of 63Cu and 17O were measured over a wide hole doping range from light-to heavy-doped systems, LSCO, YBCO, HBCCO, BSCCO, TBCCO and TBCO, together with impurity and pressure effect. By analysing vQ, K and T1, the local hole numbers of Cu and O at the CuO2 plane, n(Cu) and n(O) the relative magnitude of the uniform susceptibility, χ0 and the low-frequency component of the antiferromagnetic spin fluctuations (AFSF), χQ/Γ (χQ is the staggered susceptibility and Γ is the characteristic energy of the spin fluctuation at q = 0) are obtained. The relation between n(Cu), n(O) and χQ, χQ/Γ, TC, etc. were discussed. There are optimum values of n(Cu)/2n(O) and n(Cu) + 2n(O) to give maximum TC. The NMR results in the superconducting state are well-explained by d-wave pairing model. The result is consistent with the AFSF mediated superconducting model.

Original languageEnglish
Pages (from-to)478-483
Number of pages6
JournalPhysica B: Condensed Matter
Volume223-224
Issue number1-4
DOIs
Publication statusPublished - Jun 2 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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  • Cite this

    Asayama, K., Kitaoka, Y., Zheng, G. Q., Ishida, K., & Magishi, K. (1996). NMR study of high-TC superconductors. Physica B: Condensed Matter, 223-224(1-4), 478-483. https://doi.org/10.1016/0921-4526(96)00153-6