Field and temperature dependence of the superfluid density in LaFeAsO&lt;sub&gt;1-&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;F&lt;sub&gt;&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt; superconductors: a muon spin relaxation study

Luetkens, H.; Klauss, H.-H.; Khasanov, R.; Amato, A.; Klingeler, R.; Hellmann, I.; Leps, N.; Kondrat, A.; Hess, C.; Köhler, A.; Behr, G.; Werner, J.; Büchner, B.

doi:10.1103/PhysRevLett.101.097009

Field and temperature dependence of the superfluid density in LaFeAsO_1-xF_x superconductors: a muon spin relaxation study

Luetkens H, Klauss H-H, Khasanov R, Amato A, Klingeler R, Hellmann I, Leps N, Kondrat A, Hess C, Köhler A, Behr G, Werner J & Büchner B

Citation

Luetkens, H., Klauss, H. H., Khasanov, R., Amato, A., Klingeler, R., Hellmann, I., … Büchner, B. (2008). Field and temperature dependence of the superfluid density in LaFeAsO_1-xF_x superconductors: a muon spin relaxation study. Physical Review Letters, 101(9), 097009 (4 pp.). https://doi.org/10.1103/PhysRevLett.101.097009

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:19030

We present zero field and transverse field muon spin relaxation experiments on the recently discovered Fe-based superconductor LaFeAsO_1−xF_x (x = 0.075 and x = 0.1). The temperature dependence of the deduced superfluid density is consistent with a BCS s-wave or a dirty d-wave gap function, while the field dependence strongly evidences unconventional superconductivity. We obtain the in-plane penetration depth of λ_ab(0) = 254(2) nm for x = 0.1 and λ_ab(0) = 364(8) nm for x = 0.075. Further evidence for unconventional superconductivity is provided by the ratio of T_c versus the superfluid density, which is close to the Uemura line of high-T_c cuprates.