To determine the superconducting gap function of YNi2B2C, we calculate the local density of states (LDOS) around a single vortex core with the use of Eilenberger theory and the band structure calculated by local density approximation assuming various gap structures with point-nodes at different positions. We also calculate the angular-dependent heat capacity in the vortex state on the basis of the Doppler-Shift method. Comparing our results with the STM/STS experiment, the angular-dependent heat capacity and thermal conductivity, we propose the gap-structure of YNi2B2C, which has the point-nodes and gap minima along <110>. Our gap-structure is consistent with all results of angular-resolved experiments.
@article{arxiv.0706.1863,
title = {Positions of Point-Nodes in Borocarbide Superconductor YNi2B2C},
author = {Yuki Nagai and Yusuke Kato and Nobuhiko Hayashi and Kunihiko Yamauchi and Hisatomo Harima},
journal= {arXiv preprint arXiv:0706.1863},
year = {2008}
}