Published February 1, 2003 | Version v1
Journal article Metadata-only

Andreev-reflection study in MgB2

Creators

  • 1. Institute of Experimental Physics, Slovak Academy of Sciences (Slovakia)
  • 2. Grenoble High Magnetic Field Laboratory, Max-Planck-Institut fuer Festkoerperforschung and Centre National de la Recherche Scientifique, BP166, F-38042 Grenoble (France)
  • 3. Laboratoire d'Etudes des Proprietes Electroniques des Solides, Centre National de la Recherche Scientifique, BP166, F-38042 Grenoble (France)
  • 4. Departement de Recherche Fondamentale sur la Matiere Condensee, CEA-Grenoble, F-38054 Grenoble (France)

Description

Point-contact measurements have been performed on polycrystalline MgB2 samples using a Cu counter electrode. The current-voltage (I-V) characteristics reveal Andreev-reflection structures from the ballistic transport across the normal-metal/superconductor interface. The spectra contain two different energy gaps which close near the same bulk critical temperature. These results support the multiband model of superconductivity for MgB2 proposed by Liu et al. Point-contact experiments in a magnetic field show that the small-gap structure disappears in fields of 1-2 T whereas the large-gap structure is suppressed in larger fields going up to around 15 T. Nonlinearities in the current-voltage characteristics contain information on the energy dependence of the electron-phonon interaction

Availability note (English)

Available online at http://stacks.iop.org/0953-2048/16/162/u30206.pdf or at the Web site for the journal Superconductor Science and Technology (ISSN 1361-6668) http://www.iop.org/

Additional details

Identifiers

URL
http://stacks.iop.org/0953-2048/16/162/u30206.pdf; http://www.iop.org/;
PII
S0953-2048(03)55766-9;

Publishing Information

Journal Title
Superconductor Science and Technology
Journal Volume
16
Journal Issue
2
Journal Page Range
p. 162-166
ISSN
0953-2048
CODEN
SUSTEF

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
34026203
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ELECTRIC CONDUCTIVITY; ELECTRON-PHONON COUPLING; ENERGY DEPENDENCE; ENERGY GAP; HIGH-TC SUPERCONDUCTORS; INTERFACES; MAGNESIUM BORIDES; POLYCRYSTALS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BORIDES; BORON COMPOUNDS; COUPLING; CRYSTALS; ELECTRICAL PROPERTIES; MAGNESIUM COMPOUNDS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TYPE-II SUPERCONDUCTORS