In order to determine the superconducting gap structure of the borocarbide superconductor YNi2B2 C, we have measured the angular variation of the c-axis thermal conductivity Kzz in magnetic field rotated within the ab-planes. A clear fourfold symmetry with narrow cusps was observed in the angular variation of kzz. These results provide a strong evidence that the gap function has point nodes which are located along the a- and b-axes of the crystal.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics