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We present a study of the superconducting gap structure in the iron-pnictideseries BaFe2(As1-xPx)2. By measuring the variation of the specific heat as afunction of temperature and magnetic field we are able to determine the numberand Fermi surface location of the nodes in the superconducting gap. Inparticular, from measurements of the variation of the specific heat as themagnetic field is rotated in the ab plane of the sample we conclude that thenodes are in the [110] directions. Then from a quantitative analysis of thetemperature and field dependence of the specific heat we further conclude thatnodes exists on all Fermi surface sheets.

Superconducting gap structure of BaFe_2(As_{1-x}P_{x})_2