Journal article
MgB2: directional tunnelling two-band superconductivity
Superconductor science & technology, v 16(2), pp 156-161
01 Feb 2003
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have studied the anisotropic superconductor MgB2 using a combination of scanning electron microscopy and scanning tunnelling spectroscopy. Tunnelling spectroscopy performed on thin films and pellets reveals two distinct energy gaps at Delta(1) = 2.3 meV and Delta(2) = 7.1 meV. On different crystallites within the polycrystalline sample different spectral weights of the partial densities of states (PDOS) were observed. They reflect different tunnelling directions with respect to the crystallographic orientation of the grain in a multiband system. Indeed when tunnelling in the c-axis films only one superconducting gap is observed, which is associated with the 3D band in this system. Temperature evolution of the tunnelling spectra reveals that both gaps close simultaneously near the bulk critical temperature, Our experimental findings are consistent with the two-band superconductivity scenario in the presence of strong pair interaction between the two bands [1].
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Details
- Title
- MgB2: directional tunnelling two-band superconductivity
- Creators
- M Iavarone - Argonne National LaboratoryG Karapetrov - Argonne National LaboratoryA Koshelev - Argonne National LaboratoryW K Kwok - Argonne National LaboratoryD Hinks - Argonne National LaboratoryG W Crabtree - Argonne National LaboratoryW N Kang - Pohang University of Science and TechnologyE M ChiH J Kim - Pohang University of Science and TechnologyS I Lee - Pohang University of Science and Technology
- Publication Details
- Superconductor science & technology, v 16(2), pp 156-161
- Publisher
- Iop Publishing Ltd
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000181335600006
- Scopus ID
- 2-s2.0-0037322764
- Other Identifier
- 991019295292704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied
- Physics, Condensed Matter