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Journal article
Energy gap substructures in conductance measurements of MgB2-based Josephson junctions: beyond the two-gap model
Superconductor science & technology, v 28(5)
14 Apr 2015
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Several theoretical analyses of the two superconducting energy gaps of magnesium diboride, and , predict substructures within each energy gap. We report additional experimental evidence for these features, in tunneling conductance data using multiple samples measured at very low temperatures. The absence of these features in c-axis tunneling, and a sharp peak in the subgap (associated with the counterelectrode material), support the conclusion that these features are intrinsic to MgB2. By demonstrating the inadequacy of a simple two-gap model in fitting the data, we illustrate that distinctions between theoretical models of energy gap substructures are experimentally accessible.
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Details
- Title
- Energy gap substructures in conductance measurements of MgB2-based Josephson junctions: beyond the two-gap model
- Creators
- Steven Carabello - Drexel UniversityJoseph G Lambert - Drexel UniversityJerome Mlack - Drexel UniversityWenqing Dai - Pennsylvania State UniversityQi Li - Pennsylvania State UniversityKe Chen - Temple UniversityDaniel Cunnane - Temple UniversityC G Zhuang - Temple UniversityX X Xi - Temple UniversityRoberto C Ramos - Indiana Wesleyan UniversityKenneth Chen - Digital Media
- Publication Details
- Superconductor science & technology, v 28(5)
- Publisher
- IOP Publishing
- Number of pages
- 10
- Grant note
- DMR-1206561 / National Science Foundation (http://dx.doi.org/10.13039 100000001) DE-FG02-08ER46531 / U.S. Department of Energy (http://dx.doi.org/10.13039 100000015) N00014-13-1-0052 / Office of Naval Research (http://dx.doi.org/10.13039 100000006)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Digital Media
- Web of Science ID
- WOS:000353015700021
- Scopus ID
- 2-s2.0-84927624654
- Other Identifier
- 991019173534904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Applied
- Physics, Condensed Matter