Microwave surface impedance measurements of LiFeAs single crystals

Yoshinori Imai, Hideyuki Takahashi, Kentaro Kitagawa, Kazuyuki Matsubayashi, Noriyuki Nakai, Yuki Nagai, Yoshiya Uwatoko, Masahiko Machida, Atsutaka Maeda

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We report results of microwave surface impedance measurements of LiFeAs single crystals. The in-plane penetration depth depends on temperature exponentially at low temperatures, which strongly suggests that this material has the nodeless superconducting gap. The temperature dependence of the superfluid density indicates that LiFeAs is a multigap superconductor with at least two isotropic gaps. In addtion, the real part of the microwave conductivity exhibits a large enhancement below Tc, indicating that the quasi-particle relaxation time, τ, increases rapidly below T c. We believe that this enhancement is rather common to all superconductors where an inelastic scattering is dominant above Tc, irrespective of the strength of the electron correlation.

Original languageEnglish
Article number013704
JournalJournal of the Physical Society of Japan
Issue number1
Publication statusPublished - 2011 Jan


  • Iron-based superconductors
  • LiFeAs
  • Microwave surface impedance
  • Penetration depth
  • Superconducting gap structure


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