Superconducting gap structure of κ-(BEDT-TTF)_2Cu(NCS)2 probed by thermal conductivity
Abstract
The thermal conductivity of organic superconductor κ-(BEDT-TTF)_2Cu(NCS)2 (T_c=10.4 K) has been studied in a magnetic field rotating within the 2D superconducting planes with high alignment precision. At low temperatures (T alt 0.5 K), a clear fourfold symmetry in the angular variation, which is characteristic of a d-wave superconducting gap with nodes along the directions rotated 45 degrees 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.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MARF12008M