Microwave Penetration Depth and Quasiparticle Conductivity of PrFeAsO1y Single Crystals: Evidence for a Full-Gap Superconductor

K. Hashimoto, T. Shibauchi, T. Kato, K. Ikada, R. Okazaki, H. Shishido, M. Ishikado, H. Kito, A. Iyo, H. Eisaki, S. Shamoto, and Y. Matsuda
Phys. Rev. Lett. 102, 017002 – Published 6 January 2009

Abstract

In-plane microwave penetration depth λab and quasiparticle conductivity at 28 GHz are measured in underdoped single crystals of the Fe-based superconductor PrFeAsO1y (Tc35K) 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/kBTc1.6) all over the Fermi surface. The microwave conductivity below Tc exhibits an enhancement larger than the coherence peak, reminiscent of high-Tc cuprate superconductors.

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  • Received 20 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.017002

©2009 American Physical Society

Authors & Affiliations

K. Hashimoto1, T. Shibauchi1, T. Kato1, K. Ikada1, R. Okazaki1, H. Shishido1, M. Ishikado2, H. Kito3, A. Iyo3, H. Eisaki3, S. Shamoto2, and Y. Matsuda1

  • 1Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
  • 2Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan
  • 3Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki 305-8568, Japan

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Vol. 102, Iss. 1 — 9 January 2009

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