# Resistivity measurements unveil microscopic properties of CrAs

## TL;DR

This study investigates the resistivity of CrAs across a broad temperature range, revealing that its superconductivity likely arises from magnetic fluctuations rather than phonon interactions, challenging traditional electron-phonon models.

## Contribution

It provides experimental resistivity data for CrAs and critically assesses the applicability of the Bloch-Gruneisen formula, suggesting a non phonon-mediated pairing mechanism.

## Key findings

- Resistivity cannot be fully explained by the Bloch-Gruneisen formula.
- Transport Debye temperature is well-defined.
- Evidence supports magnetic fluctuations as the pairing mechanism.

## Abstract

We report resistivity measurements of a CrAs single crystal in a wide temperature range, with the specific aim to assess the applicability of the Bloch-Gruneisen formula for electron-phonon resistivity. We find that the resistance reaches a residual value at Tc=4.2 K and its temperature dependence cannot be fitted only with a suitable Bloch-Gruneisen formula in the whole temperature range, even though we are able to calculate a well defined transport Debye temperature. The observed temperature dependent resistivity seems to suggest a non phonon-mediated superconducting pairing, supporting a magnetic fluctuation mechanism as the likely glue for the superconducting coupling.