Resistivity measurements unveil microscopic properties of CrAs

¹ Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno - I-84084 Fisciano (SA), Italy
² CNR-SPIN, UOS di Salerno - I-84084 Fisciano (SA), Italy
³ RIKEN Center for Emergent Matter Science - Wakoshi, Saitama 351-0198, Japan
⁴ International Research Centre Magtop, Institute of Physics, Polish Academy of Sciences - Aleja Lotnikw 32/46, PL-02668 Warsaw, Poland
⁵ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
⁶ Songshan Lake Materials Laboratory, Dongguan - Guangdong 523808, China
⁷ School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100190, China

Received: 6 December 2018
Accepted: 7 March 2019

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-Grüneisen formula for electron-phonon resistivity. We find that the resistance reaches a residual value at and its temperature dependence cannot be fitted only with a suitable Bloch-Grüneisen 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.