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Substitutions in Hg-cuprate superconductors

Published online by Cambridge University Press:  03 March 2011

V. Kirtikar ,
K.K. Singh  and
D.E. Morris
V. Kirtikar
Affiliation:
Morris Research Inc., 1918 University Avenue, Berkeley, California 94704
K.K. Singh
Affiliation:
Morris Research Inc., 1918 University Avenue, Berkeley, California 94704
D.E. Morris
Affiliation:
Morris Research Inc., 1918 University Avenue, Berkeley, California 94704
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Abstract

Several substitutions have been attempted in the Hg layer of the Hg 1212 and 1223 cuprate superconductors. A new series of (Hg,Bi)1212 superconducting compounds has been synthesized. The highest Tc of the series (92 K) is found for the composition (Hg0.67Bi0.33)Sr2(Y0.5Ca0.5)Cu2O7−δ, with lattice constants a = 3.811 Å and c = 12.002 Å. X-ray diffraction and SEM with EDX analysis confirm that Hg is indeed incorporated in the structure. High-pressure oxygenation at 250 bar and 400 °C changes the magnetization curve, adding a second transition at ∼42 K; the 92 K transition remains unchanged. High-pressure oxygenation of Pb-substituted composition of the 1223 system, (Hg0.67Pb0.33)Ba2Ca2Cu3O8 also leads to the formation of low temperature phase with Tc = 67 K. The low Tc phase is associated with the incorporation of extra oxygen, possibly in the Hg layer.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2809 - 2813
Copyright
Copyright © Materials Research Society 1994

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References

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