Evidence for nodal superconductivity in LaFePO

Details Evidence for nodal superconductivity in LaFePO Evidence for nodal superconductivity in LaFePO

2008-12-19

arxiv.org/abs/0812.3858v1

Phys. Rev. Lett. 102, 147001 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.102.147001

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 $s_\pm$ state where there 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 $\sim$ 100 mK. We find that $\lambda(T)$ varies almost perfectly linearly with $T$ strongly suggesting the presence of gap nodes in this compound. Taken together with other data, this suggests the gap function may not be generic to all pnictide superconductors.

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