Vortex coupling in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} using controlled sample geometry

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00753874· OSTI ID:443657

Trawick, M L; Ammirata, S M; Keener, C D ^[1]

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1. Ohio State Univ., Columbus, OH (United States); and others

The flux transformer geometry has been useful for studying vortex coupling in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} crystals but is limited by the difficulty of controlling sample size. The authors have used an argon ion mill to etch two channels into the top face of a Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} crystal to reproduce the effects of the flux transformer geometry with more precise control over effective sample dimensions. The temperature dependence of the transformer voltage in such a crystal shows a pronounced peak between 87 K and 89 K which is linear with current. Application of a magnetic field (H {parallel} c-axis) sharply suppresses the peak, broadens it, and shifts it to lower temperatures. The peak in the transformer voltage and its current and field dependence are consistent with interlayer Josephson coupling of thermally excited vortices.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 443657
• Report Number(s): CONF-960808--; CNN: Grant DMR 95-01272
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
COUPLING
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
MAGNETIC FLUX
STRONTIUM OXIDES