The Properties of the Superconducting State in YNi2B2C: The One-Band Eliashberg Approach

TL;DR

This paper uses the one-band Eliashberg model to calculate thermodynamic parameters of the superconducting state in YNi2B2C, showing good agreement with experimental data for key ratios.

Contribution

It applies the one-band Eliashberg approach with an effective Eliashberg function to analyze YNi2B2C's superconducting properties, providing detailed thermodynamic ratios.

Findings

Calculated ratios R1, R2, R3 match experimental data

R1 agrees with experimental data, R2 and R3 show very good agreement

Thermodynamic parameters are accurately modeled using the Eliashberg approach

Abstract

The basic thermodynamic parameters of the superconducting state in $\rm{YNi_{2}B_{2}C}$ were calculated in the framework of the one-band Eliashberg model. The effective Eliashberg function, determined on the basis of the transport function (R.S. Gonnelli, {\it et al.}, Physica C \textbf{341}, 1957 (2000)), was used during calculations. It was shown that the dimensionless ratios are equal to: $R_{1}\equiv 2\Delta(0)/k_{B}T_{C}=3.87$, $R_{2}\equiv\Delta C(T_{C})/C^{N}(T_{C})=1.79$ and $R_{3}\equiv T_{C}C^{N}(T_{C})/H_{C}^{2}(0)=0.159$. The value $R_{1}$ fairly agrees with the experimental data whereas $R_{2}$ and $R_{3}$ agree very well.