Antiferromagnetism in YBa2Cu3O6+x: Ga and Zn substitutions I. 89Y NMR determination of the Néel temperature

✍ Scribed by H. Alloul; T. Ohno; H. Casalta; J.F. Marucco; P. Mendels; J. Arabski; G. Collin; M. Mehbod

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 823 KB
• Volume: 171
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90251-9

✦ Synopsis

The Nrel temperature TN of YBa2 (Cu~ _rM~) aOr÷x for pure (0 < x < 0.3 ) and M = Zn and Ga doped samples (x< 0.2 ) has been measured from the abrupt increase of the s9y NMR width with decreasing T. A rather weak variation of TN and of the NMR width in the antiferromagnetic state has been detected upon Zn or Ga doping. This leads us to conclude that a majority of Zn atoms are substituted on the Cu ( 1 ) site. In the absence of paramagnetic moments on the Cu ( 1 ) layer, the magnetic interactions between CuO2 bilayers might be assigned to dipole-dipole couplings, except if the correlation length for the 2D bilayers has a much steeper T dependence than for La2CuO4. A detailed analysis of the hole doping in the pure compounds is attempted.