Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-14
Phys. Rev. B 82, 014522 (2010)
Physics
Condensed Matter
Superconductivity
Expanded version with additional experimental details (5 pages)
Scientific paper
10.1103/PhysRevB.82.014522
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 the magnetic 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 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 ($d_{xy}$ symmetry)
Carrington Alan
Malone Liam
Schlueter John A.
Taylor O. J.
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