Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.147001
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Funding
- EPSRC
- DOE, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- EPSRC [EP/F038836/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/C511778/1, EP/F038836/1] Funding Source: researchfish
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In several iron-arsenide superconductors there is strong evidence for a fully gapped superconducting state consistent with either a conventional s-wave symmetry or an unusual s(+/-) state where the gap changes sign between the electron and hole Fermi-surface sheets. Here we report measurements of the penetration depth lambda(T) in very clean samples of the related iron-phosphide superconductor, LaFePO, at temperatures down to similar to 100 mK. We find that lambda(T) varies approximately linearly with T strongly suggesting the presence of gap nodes in this compound. Taken together with other data, this suggests the gap function is not universal for all pnictide superconductors.
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