Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-19
Phys. Rev. Lett. 102, 017002 (2009).
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures. Version accepted for publication in Phys. Rev. Lett. For related results of hole-doped 122 system, see arX
Scientific paper
10.1103/PhysRevLett.102.017002
In-plane microwave penetration depth $\lambda_{ab}$ and quaiparticle conductivity at 28 GHz are measured in underdoped single crystals of the Fe-based superconductor PrFeAsO$_{1-y}$ ($T_c\approx 35$ K) by using a sensitive superconducting cavity resonator. $\lambda_{ab}(T)$ shows flat dependence at low temperatures, which is incompatible with the presence of nodes in the superconducting gap $\Delta({\bf k})$. The temperature dependence of the superfluid density demonstrates that the gap is non-zero ($\Delta/k_BT_c\gtrsim 1.6$) all over the Fermi surface. The microwave conductivity below $T_c$ exhibits an enhancement larger than the coherence peak, reminiscent of high-$T_c$ cuprate superconductors.
Eisaki Hiroshi
Hashimoto Katsumi
Ikada K.
Ishikado Motoyuki
Iyo Akira
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