Accession Number:

AD1105508

Title:

Current Phase Relation in a Short Clean Josephson Junction Model: Application to MgB2

Descriptive Note:

Journal Article - Open Access

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LEXINGTON United States

Personal Author(s):

• Oates,Daniel E.
• Agassi,Y. D.

Report Date:

2020-03-18

Pagination or Media Count:

13.0

Abstract:

Motivated by recent data on high-quality MgB2 thin films implying that the smaller energy gap has l6 i-wave symmetry, we consider a simple model for an all-MgB2 symmetric Josephson JunctionJJ. The model assumes an arbitrary-strength delta-function barrier and one-dimensional current conduction. It is shown that in this context a nodal energy gap with i-wave symmetry acts as anisotropic energy gap s-wave with an amplitude modified by the energy-gap misalignment-angle with respect to the crystal principal axes. The corresponding exact Greens function in momentum space is derived employing a novel approach. The ensuing current-phase relations in the strong and weak barrier-strengths limits are calculated and found to confirm known results, e.g., the Ambegaokar-Baratoff current-phase relation. Inspired by an HTS experiment that established the d-wave energy gap symmetry, we propose a JJ-related experiment with aMgB2 bicrystal to confirm our premise that the smaller energy has i-wave symmetry.

Descriptors:

• josephson junctions
• greens function
• superconductors
• delta functions
• energy gaps
• wave power
• superconductivity
• crystal structure
• critical temperature
• couplings
• energy bands
• integrals
• current density
• band structures

Subject Categories:

• Electrical and Electronic Equipment
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE