Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-31
Phys. Rev. B 82, 014526 (2010)
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures, 1 table. Extended version to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.82.014526
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.
Carrington Alan
Eisaki Hiroshi
Fukazawa Hedeto
Hashimoto Katsumi
Ikeda Hiroaki
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