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Fullerene Superconductors: Effects of Molecular Orientation and Valence

Published online by Cambridge University Press:  15 February 2011

T. Yildirim ,
L. Barbedette ,
K. KniaŹ ,
J. E. Fischer ,
C. L. Lin ,
N. Bykovetz ,
P. W. Stephens ,
P. E. Sulewski  and
S. C. Erwin
T. Yildirim
Affiliation:
National Institute of Standards and Technology, Gaithersburg MD 20899 University of Pennsylvania, Philadelphia, PA 19104
L. Barbedette
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
K. KniaŹ
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
J. E. Fischer
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
C. L. Lin
Affiliation:
Temple University, Philadelphia PA 19122
N. Bykovetz
Affiliation:
Temple University, Philadelphia PA 19122
P. W. Stephens
Affiliation:
State University of New York, Stony Brook NY 11794
P. E. Sulewski
Affiliation:
AT&T Bell Labs, Murray Hill NJ 07974
S. C. Erwin
Affiliation:
Naval Research Laboratory, Washington DC 20375
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Abstract

We report results of high-resolution x-ray diffraction, dc magnetometry and Raman scattering on the quaternary alkali and ternary mixed alkali-alkaline earth fullerene compounds Na2RbxCs1−x C60 (0 < x < 1) and Rb3−δ BaδC60 (δ ∼ 0.4 and 2.0). These have the same cubic space lattices as K3C60 and Rb3C60 however the former exhibit long-range orientational correlations with Pa3 symmetry and the latter have N > 3 delocalized electrons per molecule. We show that the dependence of Tc on lattice constant is much steeper for the ordered as compared to the merohedrally disordered phases with N = 3, and that within the constraint of cubic symmetry Tc decreases significantly with increasing N > 3, in disagreement with some theoretical predictions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 359: Symposium G – Science and Technology of Fullerene Materials , 1994 , 273
Copyright
Copyright © Materials Research Society 1995

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References

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