NMR in highly correlated superconductors

K. Asayama, Y. Kitaoka, Guo-Qing Zheng, K. Ishida, S. Ohsugi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Results of our systematic NMR study in high Tc cuprates are reviewed. The antiferromagnetic spin fluctuations (AFSF) decrease in the order of La1.85Sr0.15CuO4. YBa2Cu3O7 and Tl2Ba2CuO6+y. 1/T1 of63Cu in the CuO2 plane in the normal state follows essentially a Curie-Weiss law at high temperature and T1T = const. law at low temperature. The temperature dependence of 1/T1 and the Knight shift together with their impurity effect in the superconducting state strongly suggest d-wave pairing implying the AFSF to be responsible for the occurrence of superconductivity. From the NQR frequency measurement the density of Cu 3d and O 2p holes decreases and increases, respectively, in the order of La, Y and Tl compounds, which is consistent with the change of AFSF. The relation between Tc and vQ, and their pressure dependence suggest that there exists and optimum value of the ratio of Cu 3d and O 2p hole density to give a maximum in Tc.

Original languageEnglish
Pages (from-to)835-849
Number of pages15
JournalHyperfine Interactions
Volume79
Issue number1-4
DOIs
Publication statusPublished - Mar 1993
Externally publishedYes

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Spin fluctuations
Superconducting materials
Nuclear magnetic resonance
nuclear magnetic resonance
Curie-Weiss law
frequency measurement
Superconductivity
Temperature
pressure dependence
cuprates
superconductivity
occurrences
Impurities
impurities
temperature dependence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Electronic, Optical and Magnetic Materials

Cite this

Asayama, K., Kitaoka, Y., Zheng, G-Q., Ishida, K., & Ohsugi, S. (1993). NMR in highly correlated superconductors. Hyperfine Interactions, 79(1-4), 835-849. https://doi.org/10.1007/BF00567615

NMR in highly correlated superconductors. / Asayama, K.; Kitaoka, Y.; Zheng, Guo-Qing; Ishida, K.; Ohsugi, S.

In: Hyperfine Interactions, Vol. 79, No. 1-4, 03.1993, p. 835-849.

Research output: Contribution to journalArticle

Asayama, K, Kitaoka, Y, Zheng, G-Q, Ishida, K & Ohsugi, S 1993, 'NMR in highly correlated superconductors', Hyperfine Interactions, vol. 79, no. 1-4, pp. 835-849. https://doi.org/10.1007/BF00567615
Asayama K, Kitaoka Y, Zheng G-Q, Ishida K, Ohsugi S. NMR in highly correlated superconductors. Hyperfine Interactions. 1993 Mar;79(1-4):835-849. https://doi.org/10.1007/BF00567615
Asayama, K. ; Kitaoka, Y. ; Zheng, Guo-Qing ; Ishida, K. ; Ohsugi, S. / NMR in highly correlated superconductors. In: Hyperfine Interactions. 1993 ; Vol. 79, No. 1-4. pp. 835-849.
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