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The symmetry and structure of the superconducting gap in the Fe-basedsuperconductors are the central issue for understanding these novel materials.So far the experimental data and theoretical models have been highlycontroversial. Some experiments favor two or more constant or nearly-constantgaps, others indicate strong anisotropy and yet others suggest gap zeros("nodes"). Theoretical models also vary, suggesting that the absence orpresence of the nodes depends quantitatively on the model parameters. Anopinion that has gained substantial currency is that the gap structure, unlikeall other known superconductors, including cuprates, may be different indifferent compounds within the same family. A unique method for addressing thisissue, one of the very few methods that are bulk and angle-resolved, calls formeasuring the electronic specific heat in a rotating magnetic field, as afunction of field orientation with respect to the crystallographic axes. Inthis Communication we present the first such measurement for an Fe-basedhigh-Tc superconductor (FeBSC). We observed a fourfold oscillation of thespecific heat as a function of the in-plane magnetic field direction, whichallowed us to identify the locations of the gap minima (or nodes) on the Fermisurface. Our results are consistent with the expectations of an extended s-wavemodel with a significant gap anisotropy on the electron pockets and the gapminima along the \Gamma M (or Fe-Fe bond) direction.

Anisotropic Structure of the Order Parameter in FeSe0.45Te0.55 Revealed by Angle Resolved Specific Heat