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L'oxychromate Tl3(CrO4)Sr8Cu4O16 : phénomènes d'ordre entre le thallium et le chrome*

Published online by Cambridge University Press:  15 March 1998

F. Letouzé ,
C. Martin ,
C. Michel ,
M. Hervieu ,
A. Maignan ,
R. Seshadri  and
B. Raveau
F. Letouzé
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
C. Martin
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
C. Michel
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
M. Hervieu*
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
A. Maignan
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
R. Seshadri
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
B. Raveau
Affiliation:
CRISMAT, CNRS, UMR 6508, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
*
[email protected]
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Abstract

Long range ordering between chromium and thallium has been evidenced for the first time in copper oxychromate Tl3(CrO4)Sr8Cu4O16 using HREM, XRD and ND. This compound, which crystallizes in an orthorhombic cell with a = 3.7803(1) Å, b = 15.2573(2) Å and c = 17.6737(3) Å  derives from the "1201" TlSr2CuO5 structure by replacing one thallium oxygen polyhedra out of four by one CrO4 group in an ordered way. The Mayn features that characterize this original structure deal with the waving character of the [CuO2]∞ layers, and the absolute planar character of the [(Tl,Cr)O]∞ layers. In the [(Tl,Cr)O]∞ layers, the thallium and oxygen atoms form triple ribbons of edge-sharing TlO4 tetrahedra and TlO6 octahedra running along a, whereas the CrO4 tetrahedra are displayed in rows running along a, but are disconnected from each other and from the other polyhedra in the layer. Two kinds of CuO6 octahedra are observed, whose distortions originate from their connection with different polyhedra along c. This superconductor, whose Tc can be raised to 34 K after argon-hydrogen annealing, exhibits a rather high superconducting volume fraction (> 40%) compared to other "1201" thallium cuprates.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 1 , Issue 3 , March 1998 , pp. 285 - 288
Copyright
© EDP Sciences, 1998

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Footnotes

*

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