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We report specific heat measurements of the organic superconductors$\kappa$-(ET)$_2$Cu(NCS)$_2$ and $\kappa$-(ET)$_2$Cu[N(CN)$_2$]Br. When themagnetic field is rotated in the highly conducting planes at low temperature($T\simeq 0.4$ K), we observe clear oscillations of specific heat which have astrong fourfold component. The observed strong field and temperature dependenceof this fourfold component identifies it as originating from nodes in thesuperconducting energy gap which point along the in-plane crystal axes($d_{xy}$ symmetry)

physical review. b, condensed matter and materials physics

Location of gap nodes in the organic superconductors  $\kappa$-(ET)$_2$Cu(NCS)$_2$ and $\kappa$-(ET)$_2$Cu[N(CN)$_2$]Br determined  by magnetocalorimetry