Vortex Lattice and Quasiparticle Density of States in CeRu2 Studied by Scanning Tunneling Spectroscopy

Hideaki Sakata, Nobuhiko Nishida, Masato Hedo, Kenji Sakurai, Yoshihiko Inada, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1970-1973
Number of pages4
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - Jul 2000
Externally publishedYes


  • CeRu
  • Scanning tunneling microscopy
  • Scanning tunneling spectroscopy
  • Superconductor
  • Vortex lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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