Electron-quasiparticle interaction in $\mathrm{DyN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$ measured by point-contact spectroscopy

Abstract

The electron-quasiparticle interaction (EQI) spectral function has been measured for $\mathrm{DyN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$ in the normal state at low temperatures by means of point-contact spectroscopy (PCS). A low-frequency peak is found around $eV\sim 5meV$. It becomes measurable at $T_m^{\ast }\simeq 15K$ and grows in intensity with constant width as the temperature is lowered. We argue that this peak arises from the strong interaction of conduction electron with coupled crystal-electric-field-phonon excitations whose branches cross at low energy. The comparison with PC spectra for $\mathrm{HoN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$ suggests that a similar peak also exists for this compound. The magnitude of the point-contact EQI parameter ${\lambda }_{PC}$ for $\mathrm{DyN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$ is estimated. $\text{c◯}$2000 Published by Elsevier Science B.V. All rights reserved.

10 pages, 8 figures

References in corpus (1)

• Point-contact spectroscopy of superconducting energy gap in $\mathrm{DyN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$

Cited by in corpus (3)

• Point-contact spectroscopy of superconducting energy gap in $\mathrm{DyN}{\mathrm{i}}_2{\mathrm{B}}_2\mathrm{C}$
• Point-contact spectroscopy of the antiferromagnetic superconductor HoNi2B2C in the normal and superconducting state
• Point-contact study of the LuNi2B2C borocarbide superconducting film