Antiferromagnetism in hydrated 123 compounds

Details Antiferromagnetism in hydrated 123 compounds Antiferromagnetism in hydrated 123 compounds

1999-06-18

arxiv.org/abs/cond-mat/9906295v1

Pis'ma v ZhETF v.69, iss.10, pp.739-744 (1999)

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures

Scientific paper

10.1134/1.568092

Copper nuclear quadrupole resonance (NQR) and zero field nuclear magnetic resonance (ZFNMR) studies of YBa$_2$Cu$_3$O$_{6.5}$ show that a magnetic phase appears in underdoped 123 superconductors treated in ambient wet air. The studies give convincing evidence that the ``empty'' CuO chains play the role of easy water insertion channels. The reaction occurs first in ordered regions of the crystallites. The final product of the reaction is a non-superconducting antiferromagnetic compound characterized by at least two types of magnetically ordered copper ions with ZFNMR spectra respectively in the frequency ranges of 46-96 and 96-135 MHz respectively. Even for powder samples fixed in an epoxy resin, the reaction is found to occur partly after a few years.

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