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M. J. Naughton; R. C. Yu; P. K. Davies; J. E. Fischer; R. V. Chamberlin; Z. Z. Wang; T. W. Jing; N. P. Ong; P. M. Chaikin

doi:10.1103/PhysRevB.38.9280

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Orientational anisotropy of the upper critical field in single-crystal Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{7}$ and ${Bi}_{2.2} Ca {Sr}_{1.9} {Cu}_{2} O_{8 + x}$

M. J. Naughton, R. C. Yu, P. K. Davies, J. E. Fischer, R. V. Chamberlin, Z. Z. Wang, T. W. Jing, N. P. Ong, and P. M. Chaikin

Phys. Rev. B 38, 9280(R) – Published 1 November 1988

Abstract

We have measured the dependence of the upper critical magnetic field upon orientation for single-crystal samples of Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{7}$ and ${Bi}_{2.2} Ca {Sr}_{1.9} {Cu}_{2} O_{8 + x}$ via four-probe resistance. We find continuous behavior of $H_{c 2} (θ)$ for small deviations from parallel orientation for the Y sample, as expected for an anisotropic, three-dimensional superconductor. For the Bi sample, however, our data are more consistent with a thin-film model, exhibiting a cusp at parallel orientation, suggesting that ${Bi}_{2.2} Ca {Sr}_{1.9} {Cu}_{2} O_{8 + x}$ is a quasi-two-dimensional system.

Received 23 May 1988

DOI:https://doi.org/10.1103/PhysRevB.38.9280

Authors & Affiliations

M. J. Naughton^* and R. C. Yu

Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

P. K. Davies and J. E. Fischer

Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104

R. V. Chamberlin

Department of Physics, Arizona State University, Tempe, Arizona 85287

Z. Z. Wang, T. W. Jing, N. P. Ong, and P. M. Chaikin^†

Department of Physics, Princeton University, Princeton, New Jersey 08544

^*Present address: Department of Physics, State University of New York at Buffalo, Buffalo, NY 14260.
^†Also at Exxon Research and Engineering Company, Route 22E, Annandale, NJ 08801.

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Vol. 38, Iss. 13 — 1 November 1988

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