Abstract
The study of the anisotropic superconductor using a combination of scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at and at 4.2 K. Different spectral weights of the partial superconducting density of states are a reflection of different tunneling directions in this multiband system. Temperature evolution of the tunneling spectra follows the BCS scenario [Phys. Rev. Lett. 3, 552 (1959)] with both gaps vanishing at the bulk . The data confirm the importance of Fermi-surface sheet dependent superconductivity in proposed in the multigap model by Liu et al. [Phys. Rev. Lett. 87, 087005 (2001)].
- Received 31 January 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.187002
©2002 American Physical Society