Evidence of gap anisotropy in superconducting YNi<SUB>2</SUB>B<SUB>2</SUB>C using directional point-contact spectroscopy

We present a study of the anisotropy in the superconducting energy gap in a single crystal of YNi<SUB>2</SUB>B<SUB>2</SUB>C (T<SUB>c</SUB>~14.6 K) using directional point-contact spectroscopy. The superconducting energy gap at 2.7 K, when measured for I||c, is 4.5 times larger than that for I||a. The energy gaps in the two directions also have different temperature dependences. Our results support a scenario with s+g like symmetry