NMR study of high-Tc superconductors

K. Asayama, Guo-Qing Zheng, Y. Kitaoka, K. Ishida, K. Fujiwara

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

From systematic measurements of Tc, Knight shift, NQR frequency of 63Cu and 17O with high-pressure measurement in high-Tc materials, La2-xSrxCuO4, YBa2Cu3O7 and Tl2Ba2CuO6+y the following results have been obtained. The staggered susceptibility at the zone boundary, χ(Q) which is a measure of the antiferromagnetic spin fluctuation decreases in order of the La, Y and Tl system. χ(Q) is governed by the number of Cu d-holes, n(Cu) and O p-holes, n(O) in the CuO2 plane. χ(Q) increases when n(Cu)/n(O) increases. Tc increases and then decreases with n(Cu)/n(O) having a maximum at an optimum value of n(Cu)/ n(O). Correlation between χ(Q) and Tc has been discussed by assuming χ(Q) to play an essential role for the occurrence of high-Tc superconductivity. The T-dependence of 1/T1 below Tc suggests strongly the d-wave pairing model.

Original languageEnglish
Pages (from-to)281-286
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume178
Issue number4-6
DOIs
Publication statusPublished - Aug 1 1991
Externally publishedYes

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Spin fluctuations
Pressure measurement
Superconductivity
Superconducting materials
Nuclear magnetic resonance
nuclear magnetic resonance
pressure measurement
superconductivity
occurrences
magnetic permeability
barium copper yttrium oxide

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

NMR study of high-Tc superconductors. / Asayama, K.; Zheng, Guo-Qing; Kitaoka, Y.; Ishida, K.; Fujiwara, K.

In: Physica C: Superconductivity and its Applications, Vol. 178, No. 4-6, 01.08.1991, p. 281-286.

Research output: Contribution to journalArticle

Asayama, K. ; Zheng, Guo-Qing ; Kitaoka, Y. ; Ishida, K. ; Fujiwara, K. / NMR study of high-Tc superconductors. In: Physica C: Superconductivity and its Applications. 1991 ; Vol. 178, No. 4-6. pp. 281-286.
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