Positions of Point-Nodes in Borocarbide Superconductor YNi2B2C

Abstract

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.

arXiv comment7 pages, 5 figures

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• Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3
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• Nodal gap detection through polar angle-resolved density of states measurements in uniaxial superconductors
• Field-angle dependence of the quasiparticle scattering inside a vortex core in unconventional superconductors
• Bandstructure and Fermi Surfaces of CeRh3B2
• Impurity Scattering Rate and Coherence factor in Vortex Core of Sign-reversing s-wave Superconductors
• Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C
• Analysis of field-angle dependent specific heat in unconventional superconductors: a comparison between Doppler-shift method and Kramer-Pesch approximation
• Unconventional superconductivity in YNi2B2C