Local Hole Distribution in the CuO2 Plane of High-Tc Cu-Oxides Studied by Cu and Oxygen NQR/NMR

Guo qing Zheng, Yoshio Kitaoka, Kenji Ishida, Kunisuke Asayama

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)

Abstract

The hole numbers at Cu and oxygen sites in the CuO2 plane in a wide variety of high-Tc materials have been extracted from the measured nuclear quadrupole frequency, vQ. The hole number in the [formula omitted] orbit, [formula omitted] is found to be more than 0.85 in La2-xSrxCuO4 (x=0.075-0.24), while decreases to 0.74 in Tl2Ba2Ca2Cu3O10. Thus estimated [formula omitted] is supported by the result that the orbital Knight shift along the c-axis, [formula omitted] increases in proportion to [formula omitted] In contrast to the decrease of [formula omitted] the hole number in the O-2pσ orbit, [formula omitted] increases in going from the La- to the Tl-systems. It has been found that Tc is determined by two parameters about holes, i.e., [formula omitted] and [formula omitted] The former tells the microscopic “doping level” of the CuO2 plane, while a smaller [formula omitted] results in a weaker antifer-romagnetic spin fluctuations of low energy. It has been found that not only a proper [formula omitted] but also a sufficiently small [formula omitted] are needed to obtain a high value of Tc.

Original languageEnglish
Pages (from-to)2524-2532
Number of pages9
Journaljournal of the physical society of japan
Volume64
Issue number7
DOIs
Publication statusPublished - Jul 1995
Externally publishedYes

Keywords

  • NMR
  • T
  • high-T oxides
  • hole distribution
  • hole number
  • nuclear quadrupole frequency

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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