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Étude par résonance quadrupolaire nucléaire de la rétention de carbone dans l'YBa2Cu3Oy≈7*

Published online by Cambridge University Press:  15 March 1998

B. Grévin ,
Y. Berthiercw ,
I. Monot ,
J. Wang  and
F. Weiss
B. Grévin
Affiliation:
UJF Grenoble I, Laboratoire de Spectrométrie Physique, BP 87, 38402 Saint-Martin-d'Hères Cedex, France
Y. Berthiercw
Affiliation:
UJF Grenoble I, Laboratoire de Spectrométrie Physique, BP 87, 38402 Saint-Martin-d'Hères Cedex, France
I. Monot
Affiliation:
Laboratoire CRISMAT/ISMRA, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
J. Wang
Affiliation:
Laboratoire CRISMAT/ISMRA, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
F. Weiss
Affiliation:
ENSPG, LMGP, rue de la Houille Blanche, Domaine Universitaire, BP 46, 38402 Saint-Martin d'Hères Cedex, France
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Abstract

We present a Nuclear Quadrupole Resonance (NQR) study of Cu(2) (planes) and Cu(1) (chains) sites in two YBa2Cu3Oy≈7 powder samples with carbon concentration equal to 500 ppm and 3000 ppm, and in a free-carbon sample. By comparison with standard spectra in YBa2Cu3Oy, we show that a new NQR line appears at 30.90 MHz, the intensity of which is strongly correlated with the amount of carbon in the sample. Moreover, according to the spin-lattice relaxation rate 1/T1 measurements at different frequencies of the spectrum, we attribute this anomalous line to the formation of clusters in which the superconductivity is destroyed by the presence of carbonate groups, which substitute preferentially for copper chain site. Those results are in good agreement with those of Wang et al. [1], obtained by high resolution electron microscopy.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 1 , Issue 3 , March 1998 , pp. 279 - 284
Copyright
© EDP Sciences, 1998

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Footnotes

*

Le contenu de cet article a été présenté aux 4es journées d'étude SEE, "Matériaux supraconducteurs à haute Tc" de Caen, les 26 et 27 March 1997.

References

* Le contenu de cet article a été présenté aux 4es journées d'étude SEE, "Matériaux supraconducteurs à haute T c" de Caen, les 26 et 27 March 1997.