Scanning tunneling microscopy (STM) and spectroscopy (STS) measurements have been performed on an intermetallic compound CeRu2 down to 2.2 K. Vacuum tunneling spectra have been measured on the surface prepared by cracking the sample in helium gas at 4.2 K. The shape and temperature dependence of the quasiparticle density of states, Ns(E, r), have been well interpreted in terms of s-wave BCS superconductors. In magnetic fields, the hexagonal vortex lattice has been imaged by measurements of NS(E = 0, r) up to 2 T. This is the first observation of the vortex lattice by STS in heavy-fermion superconductors.
- Scanning tunneling microscopy
- Scanning tunneling spectroscopy
- Vortex lattice
ASJC Scopus subject areas
- Physics and Astronomy(all)