Superconducting Gap Structure of κ−(BEDT−TTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor
K. Izawa, H. Yamaguchi, T. Sasaki, Yuji Matsuda
DOI 10.1103/PhysRevLett.88.027002 · Physical Review Letters
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Abstract
The thermal conductivity of organic superconductor κ−(BEDT−TTF)2Cu(NCS)2 (Tc=10.4K) has been studied in a magnetic field rotating within the 2D superconducting planes with high alignment precision. At low temperatures ( T≲0.5K), a clear fourfold symmetry in the angular variation, which is characteristic of a d-wave superconducting gap with nodes along the directions rotated 45° relative to the b and c axes of the crystal, was resolved. The determined nodal structure is inconsistent with recent theoretical predictions of superconductivity induced by the antiferromagnetic spin fluctuation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
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