Journal
PHYSICAL REVIEW B
Volume 82, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.014526
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Funding
- JSPS
- Grants-in-Aid for Scientific Research [21340099] Funding Source: KAKEN
- EPSRC [EP/H025855/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H025855/1] Funding Source: researchfish
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Among the iron-based pnictide superconductors the material KFe2As2 is unusual in that its Fermi surface does not consist of quasinested 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 KFe2As2 is an unconventional superconductor with strong electron correlations.
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