Some improved geometries for Josephson-junction investigations of the order-parameter symmetry in high-T{sub c} superconductors

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.3249· OSTI ID:450378

Klemm, R A ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We propose two new geometries for Josephson junction experiments between the edge of an orthorhombic, untwinned single-crystal high-T{sub c} superconductor, assumed to have an order parameter of the mixed s{plus_minus}d{sub x{sup 2}{minus}y{sup 2}} variety, and a conventional, s-wave superconductor. The first geometry is a straight-edge Josephson junction cut at an angle {phi}{sub 0} with respect to the a-axis edge of a high-T{sub c} crystal. We studied the effects of a regular array of a/b steps comprising the edge upon the I{sub c}(B) pattern for different {phi}{sub 0} values. Varying {phi}{sub 0} can elucidate the locations of any purported order-parameter nodes. The second geometry is a disk cut from a high-T{sub c} single crystal, with a Josephson junction formed on the edge, centered at {phi}{sub 0}, with an angular width of {Delta}{phi}. The case {Delta}{phi}={pi} is nearly free of systematic flux trapping problems, and is shown to be particularly important in quantifying the precise amount of s/d order-parameter mixing. Smaller {Delta}{phi} values can also be useful in locating the purported order-parameter nodes. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 450378
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRYSTALS
D WAVES
GEOMETRY
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
MAGNETIC FLUX
MEASURING METHODS
MONOCRYSTALS
ORDER PARAMETERS