Abstract
The thermal conductivity of organic superconductor has been studied in a magnetic field rotating within the 2D superconducting planes with high alignment precision. At low temperatures ( ), a clear fourfold symmetry in the angular variation, which is characteristic of a -wave superconducting gap with nodes along the directions rotated relative to the and axes of the crystal, was resolved. The determined nodal structure is inconsistent with recent theoretical predictions of superconductivity induced by the antiferromagnetic spin fluctuation.
- Received 25 July 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.027002
©2001 American Physical Society