Anisotropy of point-contact spectra in the heavy-fermion superconductor
- 29 March 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (13), 2008-2011
- https://doi.org/10.1103/physrevlett.70.2008
Abstract
The heavy-fermion superconductor has been studied in the superconducting state down to 36 mK by point-contact spectroscopy. Distinct minima in the differential resistance dV/dI versus voltage V related to the energy gap are observed for current flow parallel to the crystallographic c axis, while for current flow within the basal plane such features were almost always absent. This difference, together with a comparison of the Blonder-Tinkham-Klapwijk theory, gives clear evidence for a strong gap anisotropy. This is further supported by the unusual temperature and magnetic-field dependence of the spectra.
This publication has 15 references indexed in Scilit:
- Point-contact spectroscopy of superconductingPhysical Review B, 1992
- Pressure dependence of the superconducting phases inPhysical Review B, 1991
- Phase diagram offrom ultrasonic velocity measurementsPhysical Review Letters, 1990
- Strain–order-parameter coupling and phase diagrams in superconductingPhysical Review Letters, 1990
- Critical point in the superconducting phase diagram ofPhysical Review Letters, 1989
- Specific heat of: Evidence for unconventional superconductivityPhysical Review Letters, 1989
- Point-contact spectra of the heavy-fermion superconductors Uand UPhysical Review B, 1987
- Unusual Angular and Temperature Dependence of the Upper Critical Field in UPhysical Review Letters, 1986
- Anisotropy of Transverse Sound in the Heavy-Fermion Superconductor UPhysical Review Letters, 1986
- Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversionPhysical Review B, 1982