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.

7 pages, 5 figures

References in corpus (4)

• Orientational field-dependence of low-lying excitations in mixed state of unconventional superconductors
• Analytical Formulation of the Local Density of States around a Vortex Core in Unconventional Superconductors
• Ubiquitous V-shape density of states in mixed state of clean limit type II superconductors; STM experiment and theory
• Analytical Result on Electronic States around a Vortex Core in a Noncentrosymmetric Superconductor

Cited by in corpus (5)

• Kramer-Pesch approximation for analyzing field-angle-resolved measurements made in unconventional superconductors: A calculation of the zero-energy density of states
• Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3
• Electronic structure and spin-lattice relaxation in superconducting vortex states on the kagome lattice near van Hove filling
• Field-angle dependence of the quasiparticle scattering inside a vortex core in unconventional superconductors
• Field angle dependence of the zero-energy density of states in unconventional superconductors: analysis of the borocarbide superconductor YNi2B2C