Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density

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dc.creatorHashimoto, K.
dc.creatorShibauchi, T.
dc.creatorKasahara, S.
dc.creatorIkada, K.
dc.creatorTonegawa, S.
dc.creatorKato, T.
dc.creatorOkazaki, R.
dc.creatorvan der Beek, C. J.
dc.creatorKonczykowski, M.
dc.creatorTakeya, H.
dc.creatorHirata, K.
dc.creatorTerashima, T.
dc.creatorMatsuda, Y.
dc.date2008-10-20
dc.date2009-04-24
dc.date.accessioned2026-07-07T13:15:46Z
dc.date.available2026-07-07T13:15:46Z
dc.descriptionWe report high-sensitivity microwave measurements of the in-plane penetration depth $λ_{ab}$ and quasiparticle scattering rate $1/τ$ in several single crystals of hole-doped Fe-based superconductor Ba$_{1-x}$K$_x$Fe$_2$As$_2$ ($x\approx 0.55$). While power-law temperature dependence of $λ_{ab}$ with the power $\sim 2$ is found in crystals with large $1/τ$, we observe exponential temperature dependence of superfluid density consistent with the existence of fully opened two gaps in the cleanest crystal we studied. The difference may be a consequence of different level of disorder inherent in the crystals. We also find a linear relation between the low-temperature scattering rate and the density of quasiparticles, which shows a clear contrast to the case of d-wave cuprate superconductors with nodes in the gap. These results demonstrate intrinsically nodeless order parameters in the Fe-arsenides.
dc.description4 pages, 4 figures, 1 table. Accepted for publication in Phys. Rev. Lett. Changed title as suggested by the PRL editors
dc.identifierhttps://arxiv.org/abs/0810.3506
dc.identifierhttp://arxiv.org/abs/0810.3506
dc.identifierPhys. Rev. Lett. 102, 207001 (2009).
dc.identifierdoi:10.1103/PhysRevLett.102.207001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230576
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleMicrowave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
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