Electrodynamics of the Superconducting State in CeRu2

Hiroshi Matsui, Takanori Yasuda, Masato Hedo, Rikio Settai, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga, Naoki Toyota

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have studied the complex conductivity in superconducting and normal metallic states of CeRu2 by the surface impedance measurements at millimeter-wave frequency of 45.4 GHz. The temperature dependence of the complex conductivity below Tc = 6.2 K exhibits the characteristic behaviors as seen in a conventional superconductor. The coherence peak observed in the real part σ1 provides a strong evidence for a conventional s-wave superconductivity as well as the previous NQR measurements. The temperature dependence of the penetration depth evaluated from the surface reactance at low temperatures has revealed the ratio of 2Δ(0)/kBTc = 4.4. The strong-coupling theories suggest the electron-phonon coupling strength with λep < 2. These results indicate that CeRu2 is an intermediate strong-coupling superconductor in a clean limit.

Original languageEnglish
Pages (from-to)3580-3584
Number of pages5
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 1998 Oct
Externally publishedYes


  • CeRu
  • Electrodynamics
  • Millimeter-wave
  • Penetration depth
  • Superconductor

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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