c-AXIS TWIST Bi2Sr2CaCu2O8+δ JOSEPHSON JUNCTIONS: A NEW PHASE-SENSITIVE TEST OF ORDER PARAMETER SYMMETRY

Autor:	Gerald B. Arnold, Richard A. Klemm, Kurt Scharnberg, A. Bille, C. T. Rieck
Rok vydání:	1999
Předmět:	Josephson effect Physics Condensed matter physics Order (ring theory) Statistical and Nonlinear Physics Critical current Twist Condensed Matter Physics Current density Single crystal Symmetry (physics) Quantum tunnelling
Zdroj:	International Journal of Modern Physics B. 13:3449-3454
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s0217979299003192
Popis:	Li et al. found that the critical current density [Formula: see text] across atomically clean c-axis twist junctions of Bi 2 Sr 2 CaCu 2 O 8+δ is the same as that of the constituent single crystal, [Formula: see text], independent of the twist angle ϕ0, even at and below Tc. We investigated theoretically if a dx2-y2-wave order parameter might twist by mixing in dxy-wave components, but found that such mixing cannot possibly explain the data near to Tc. Combined with group theoretical arguments, we then conclude that the order parameter contains at least a substantial s-wave component, but does not contain any purported dx2-y2-wave compoenent, except possibly below a second, unobserved phase transition. By studying tunneling models, we further conclude that the intrinsic c-axis Josephson tunneling in Bi 2 Sr 2 CaCu 2 O 8+δ is likely to be most incoherent. We also propose a c-axis junction version of a tricrystal experiment, which does not rely upon expensive substrates.
Databáze:	OpenAIRE
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