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We report superconducting (SC) properties of stoichiometric LiFeAs (Tc = 17K) studied by small-angle neutron scattering (SANS) and angle-resolvedphotoemission (ARPES). Although the vortex lattice exhibits no long-rangeorder, well-defined SANS rocking curves indicate better ordering than inchemically doped 122-compounds. The London penetration depth of 210 nm,determined from the magnetic field dependence of the form factor, is comparedto that calculated from the ARPES band structure with no adjustable parameters.Its temperature dependence is best described by a single isotropic SC gap of3.0 meV, which agrees with the ARPES value of 3.1 meV and corresponds to theratio 2Delta/kTc = 4.1, approaching the weak-coupling limit predicted by theBCS theory. This classifies LiFeAs as a weakly coupled single-gapsuperconductor, similar to conventional metals.

Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs