Zn and Ni doping effects on Tc and spin gap behavior in YBa2Cu4O8 and YBa2Cu3O6.6

G. Q. Zheng, T. Odaguchi, Y. Kitaoka, K. Asayama, Y. Kodama, K. Mizuhashi, S. Uchida

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32 Citations (Scopus)

Abstract

The existence of local moments in both Zn- and Ni-doped YBa2Cu4O8 (Y1248) is confirmed by a Curie-law T-dependence of NMR linewidth and the Cu relaxation at low T. The reduction of Cu-NQR signal intensity in Ni-doped Y1248 suggests that, in contrast to the case of Ni-doped YBa2Cu3O7 (Y1237), the Cu spin correlation around Ni is destroyed. This effect may be responsible for the larger reduction of Tc by Ni-doping than in Y1237. For Cu sites which are away from an impurity by two lattice constants, 1/T1T continues to increase below T*, at which it has a maximum in the non-doped material. The effect in reducing T*, which is sometimes called the spin gap temperature, is much more pronounced in Zn-doped samples, suggesting that the reduction of T* is mainly due to the induction of magnetic moments in the dx2-y2 orbital, which may modify Cu spin fluctuation.

Original languageEnglish
Pages (from-to)367-370
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume263
Issue number1-4
DOIs
Publication statusPublished - May 1996
Externally publishedYes

ASJC Scopus subject areas

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

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