Microwave quasiparticle conductivity of LaFePO single crystals

S. Tonegawa, K. Hashimoto, K. Ikada, M. Yamashita, H. Sugawara, T. Shibauchi, Y. Matsuda

Research output: Contribution to journalArticlepeer-review


We measured the temperature dependence of the microwave quasiparticle conductivity σ1(T) in single crystals of LaFePO (T c≃7.5K) to study the presence/absence of the coherence peak expected in s-wave superconductors. We use sensitive cavity resonators at several frequencies (15,28,60GHz). We observe a broad enhancement of σ1(T) below Tc which is almost independent of frequency. We find that such a frequency-independent enhancement is incompatible with the conventional coherence peak, and rather it can be explained by the rapid change of quasiparticle dynamics below Tc due to strong suppression of electron-electron inelastic scattering.

Original languageEnglish
Pages (from-to)S433-S434
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec


  • Coherence peak
  • Quasiparticle scattering time
  • Strong correlation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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