Resistivity and electron-phonon coupling in YNi$_2$B$_2$C single crystals

TL;DR

This study investigates the resistivity and electron-phonon interactions in YNi₂B₂C single crystals, using experimental data and theoretical models to analyze superconducting properties and tunneling conductance.

Contribution

It provides a detailed analysis of resistivity and electron-phonon coupling in YNi₂B₂C, combining experimental measurements with Eliashberg theory to explore superconducting characteristics.

Findings

Resistivity data fitted with Bloch-Grüneisen theory

Electron-phonon spectral function derived from resistivity

Normalized tunneling conductance calculated for s- and d-wave symmetries

Abstract

In this work, we present the results of precise measurements of the resistivity of YNi$_2$B$_2$C single crystals with $T_{\rm c}$ = 15.5 K as a function of the temperature, and analyze the experimental data in the framework of the Bloch-Gr\"{u}neisen theory and electron-phonon coupling. The transport electron-phonon spectral function that best fits the resistivity data is then inserted in the real-axis Eliashberg equations, which are directly solved to determine the normalized tunneling conductance both in s- and d-wave symmetry.