Evidence for a Nodal-Line Superconducting State in LaFePO
J. D. Fletcher, A. Serafin, L. Malone, J. G. Analytis, J.-H. Chu, A. S. Erickson, I. R. Fisher, A. Carrington
DOI 10.1103/PhysRevLett.102.147001 · Physical Review Letters
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Abstract
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 λ(T) in very clean samples of the related iron-phosphide superconductor, LaFePO, at temperatures down to ∼100 mK. We find that λ(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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | midpoint |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | midpoint |
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