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The structure of the superconducting order parameter in the iron-pnictidesuperconductor BaFe$_2$(As$_{0.67}$P$_{0.33}$)$_2$ ($T_c=31$\,K) with linenodes is studied by the angle-resolved thermal conductivity measurements in amagnetic field rotated within the basal plane. We find that the thermalconductivity displays distinct fourfold oscillations with minima when the fieldis directed at $\pm45^\circ$ with respect to the tetragonal a-axis. We discusspossible gap structures that can account for the data, and conclude that theobserved results are most consistent with the closed nodal loops located at theflat parts of the electron Fermi surface with high Fermi velocity.

Nodal gap structure of BaFe_2(As_{1-x}P_x)_2 from angle-resolved thermal conductivity in a magnetic field