Extraordinary effect of aluminum substitution on the upper critical field of Ba2YCu3O7

R. B. Van Dover*, L. F. Schneemeyer, J. V. Waszczak, D. A. Rudman, Jenh-Yih Juang, J. A. Cutro

*Corresponding author for this work

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Abstract

A 10% substitution of Al on the Cu(1) (chain) site of single crystals of Ba2YCu3O7 drives the material to the edge of the orthorhombic-tetragonal transition and strongly decreases the resistivity and upper critical field, compared to the unsubstituted parent compound, but has little effect on Tc. The coherence length in the ĝ-b^ plane increases twofold, while the coherence length along the axis is unchanged. These results can be reconciled with the conventional relationships between superconducting and normal-state properties only if a twofold change in the Fermi-surface area is postulated.

Original languageEnglish
Pages (from-to)2932-2935
Number of pages4
JournalPhysical Review B
Volume39
Issue number4
DOIs
StatePublished - 1 Jan 1989

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    Van Dover, R. B., Schneemeyer, L. F., Waszczak, J. V., Rudman, D. A., Juang, J-Y., & Cutro, J. A. (1989). Extraordinary effect of aluminum substitution on the upper critical field of Ba2YCu3O7. Physical Review B, 39(4), 2932-2935. https://doi.org/10.1103/PhysRevB.39.2932