Location of gap nodes in the organic superconductors κ-(ET)₂Cu(NCS)₂ and κ-(ET)₂Cu[N(CN)₂]Br determined by magnetocalorimetry
Malone, L. · Taylor, O. J. · Schlueter, J. A. · Carrington, A.
Original · EN
We report specific heat measurements of the organic superconductors κ-(ET)₂Cu(NCS)₂ and κ-(ET)₂Cu[N(CN)₂]Br. When the magnetic field is rotated in the highly conducting planes at low temperature (T≃ 0.4 K), 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)
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