Nodal Superconducting Gap in β-FeS
Abstract
Low temperature specific heat has been measured in superconductor β-FeS with Tc = 4.55 K. It is found that the low temperature electronic specific heat Ce/T can be fitted to a linear relation in the low temperature region, but fails to be described by an exponential relation as expected by an s-wave gap. We try fittings to the data with different gap structures and find that a model with one or two nodal gaps can fit the data. Under a magnetic field, the field induced specific heat γ=[Ce(H)-Ce(0)]/T shows the Volovik relation γe(H) H, suggesting the presence of nodal gap(s) in this material.
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