Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements

K. Hashimoto; A. Serafin; S. Tonegawa; R. Katsumata; R. Okazaki; T. Saito; H. Fukazawa; Y. Kohori; K. Kihou; C. H. Lee; A. Iyo; H. Eisaki; H. Ikeda; Y. Matsuda; A. Carrington; T. Shibauchi

doi:10.1103/PhysRevB.82.014526

paper

Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements

arXiv:1003.6022 · doi:10.1103/PhysRevB.82.014526

Abstract

Among the iron-based pnictide superconductors the material KFe $_{2}$ As $_{2}$ is unusual in that its Fermi surface does not consist of quasi-nested electron and hole pockets. Here we report measurements of the temperature dependent London penetration depth of very clean crystals of this compound with residual resistivity ratio $> 1200$ . We show that the superfluid density at low temperatures exhibits a strong linear-in-temperature dependence which implies that there are line nodes in the energy gap on the large zone-centered hole sheets. The results indicate that KFe $_{2}$ As $_{2}$ is an unconventional superconductor with strong electron correlations.

6 pages, 6 figures, 1 table. Extended version to be published in Phys. Rev. B

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