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We report specific-heat measurements of the organic superconductors κ- (ET) 2 Cu (NCS) 2 and κ- (ET) 2 Cu [N (CN) 2] Br. When the magnetic field is rotated in the highly conducting planes at low temperature (T0.4K), we observe clear oscillations of specific heat which have a strong fourfold component. The observed strong field and temperature dependence of this fourfold component identifies it as originating from nodes in the superconducting energy gap which point along the in-plane crystal axes (dxy symmetry).
|Journal||Physical Review B: Condensed Matter and Materials Physics|
|Publication status||Published - 16 Jul 2010|
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