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Structural Aspects of the Phase Separation in La2CuO4.032

Published online by Cambridge University Press:  28 February 2011

C. Chailloutl ,
P. Bordetl ,
J. Chenavasl ,
S.W. Cheong ,
Z. Fisk ,
M. Mareziou ,
B. Morosin  and
J.E. Schirber
C. Chailloutl
Affiliation:
Laboratoire de Cristallographie, CNRS, associé à l'Université J. Fourier, 166X, 38042 Grenoble cedex, France
P. Bordetl
Affiliation:
Laboratoire de Cristallographie, CNRS, associé à l'Université J. Fourier, 166X, 38042 Grenoble cedex, France
J. Chenavasl
Affiliation:
Laboratoire de Cristallographie, CNRS, associé à l'Université J. Fourier, 166X, 38042 Grenoble cedex, France
S.W. Cheong
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974, USA
Z. Fisk
Affiliation:
Los Alamos National Laboratory, NM 87545, USA
M. Mareziou
Affiliation:
Laboratoire de Cristallographie, CNRS, associé à l'Université J. Fourier, 166X, 38042 Grenoble cedex, France AT&T Bell Laboratories, Murray Hill, NJ 07974, USA
B. Morosin
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
J.E. Schirber
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
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Abstract

The average structure of superconducting La2CuO4.032 has been determined by single crystal neutron diffraction data. The excess oxygen is located between two adjacent LaO layers. Its presence distorts the apical‐oxygen sublattice in such a way that a short O‐O bond is formed (1.64Å). By scanning several hkl reflexions, we have confirmed that a phase separation occurs below room temperature. The peaks of the phases are in agreement with the unit cells proposed by Jorgensen et al. and Zolliker et al. However, Cmca seems to be the correct space group for both phases. La2CuO4+მ and the Ni counterpart are, thus, not isostructural.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 47
Copyright
Copyright © Materials Research Society 1990

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References

1 Chaillout, C., Cheong, S.W., Fisk, Z., Lehmann, M.S., Marezio, M., Morosin, B. and Schirber, J.E., Physica C 158 , 183 (1989).Google Scholar
2 Jorgensen, J. D., Dabrowski, B., Shiyou Pei, , Hinks, D.G., Soderholm, L., Morosin, B., Schirber, J.E., Venturini, E.L. and Ginley, D.S., Phys. Rev. B 38, 11337 (1988)Google Scholar
3Zolliker et al., to be publishedGoogle Scholar
4 Jorgensen, J.D., Dabrowski, B., Shiyou Pei, , Richards, D.R. and Hinks, D.G., to appear in Phys. Rev. B (1989)Google Scholar
5Hundley et al., to be published (1989)Google Scholar