Scanning Tunneling Spectroscopy in
- 7 May 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 86 (19), 4374-4377
- https://doi.org/10.1103/physrevlett.86.4374
Abstract
We present scanning tunneling microscopy measurements of the surface of superconducting with a critical temperature of 39 K. In zero magnetic field the conductance spectra can be analyzed in terms of the standard BCS theory with a smearing parameter . The value of the superconducting gap is 5 meV at 4.2 K, with no experimentally significant variation across the surface of the sample. The temperature dependence of the gap follows the BCS form, fully consistent with phonon-mediated superconductivity in this novel superconductor. The application of a magnetic field induces strong pair breaking as seen in the conductance spectra in fields up to 6 T.
Keywords
This publication has 11 references indexed in Scilit:
- Loss of superconductivity with the addition of Al to MgB2 and a structural transition in Mg1-x AlxB2Nature, 2001
- Superconductivity in DenseWiresPhysical Review Letters, 2001
- Thermodynamic and Transport Properties of SuperconductingPhysical Review Letters, 2001
- Strongly linked current flow in polycrystalline forms of the superconductor MgB2Nature, 2001
- Superconductivity at 39 K in magnesium diborideNature, 2001
- Boron Isotope Effect in SuperconductingPhysical Review Letters, 2001
- Scanning Tunneling Microscopy Observation of a Square Abrikosov Lattice inPhysical Review Letters, 1997
- Direct Vortex Lattice Imaging and Tunneling Spectroscopy of Flux Lines onPhysical Review Letters, 1995
- Scanning-Tunneling-Microscope Observation of the Abrikosov Flux Lattice and the Density of States near and inside a FluxoidPhysical Review Letters, 1989
- Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled SuperconductorPhysical Review Letters, 1978