Microwave penetration depth and quasiparticle conductivity of PrFeAsO1-y single crystals: Evidence for a full-gap superconductor

Kenichiro Hashimoto, T. Shibauchi, T. Kato, K. Ikada, R. Okazaki, H. Shishido, M. Ishikado, H. Kito, A. Iyo, H. Eisaki, S. Shamoto, Y. Matsuda

Research output: Contribution to journalArticlepeer-review

220 Citations (Scopus)

Abstract

In-plane microwave penetration depth λab and quasiparticle conductivity at 28 GHz are measured in underdoped single crystals of the Fe-based superconductor PrFeAsO1-y (Tc> 35K) by using a sensitive superconducting cavity resonator. λab(T) shows flat dependence at low temperatures, which is incompatible with the presence of nodes in the superconducting gap Δ(k). The temperature dependence of the superfluid density demonstrates that the gap is nonzero (Δ/kBT> 1.6) all over the Fermi surface. The microwave conductivity below Tc exhibits an enhancement larger than the coherence peak, reminiscent of high-Tc cuprate superconductors.

Original languageEnglish
Article number017002
JournalPhysical Review Letters
Volume102
Issue number1
DOIs
Publication statusPublished - 2009 Jan 5
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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