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arXiv · 1703.04130

Electron-quasiparticle interaction in $\rm DyNi_2B_2C$ measured by point-contact spectroscopy

I. K. Yanson·N. L. Bobrov·C. V. Tomy·D. McK. Paul
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Abstract

The electron-quasiparticle interaction (EQI) spectral function has been measured for $\rm DyNi_2B_2C$ in the normal state at low temperatures by means of point-contact spectroscopy (PCS). A low-frequency peak is found around $eV\sim 5\ meV$. It becomes measurable at $T_m^*\simeq 15\ K$ 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 $\rm HoNi_2B_2C$ suggests that a similar peak also exists for this compound. The magnitude of the point-contact EQI parameter $λ_{PC}$ for $\rm DyNi_2B_2C$ is estimated. $©$2000 Published by Elsevier Science B.V. All rights reserved.

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I. K. Yanson, N. L. Bobrov, C. V. Tomy, D. McK. Paul. 2017-03-12. Electron-quasiparticle interaction in $\rm DyNi_2B_2C$ measured by point-contact spectroscopy. https://doi.org/10.1016/s0921-4534(00)00226-4

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