Anomalous charge transport of superconducting Cu${}_x$PdTe${}_2$ under high pressure

Abstract

By means of high-pressure resistivity measurements on single crystals, we investigate the charge transport properties of Cu${}_x$PdTe${}_2$, notable for the combination of topological type-II Dirac semimetallic properties with superconductivity up to $T_c=2.5$ K. In both cases of pristine ($x=0$) and intercalated ($x=0.05$) samples, we find an unconventional $T^4$ power law behavior of the low-temperature resistivity visible up to $\sim$40 K and remarkably stable under pressure up to 8.2 GPa. This observation is explained by the low carrier density $n$, which strongly reduces the $k$-region available for electron-phonon scattering, as previously reported in other low-$n$ two-dimensional systems, such as multilayer graphene and semiconductor heterostructures. Our data analysis complemented by specific heat measurements and supported by previous quantum oscillation studies and \textit{ab initio} calculations suggests a scenario of one-band charge transport. Within this scenario, our analysis yields a large value of transport electron-phonon coupling constant ${\lambda }_{tr}=1.2$ at ambient pressure that appears to be strongly enhanced by pressure assuming a constant effective mass.

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Cited by in corpus (4)

• The dominance of non-electron-phonon charge carrier interaction in highly-compressed superhydrides
• Planar Hall effect in Cu intercalated PdTe${}_2$
• Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure
• Chiral anomaly and positive longitudinal magnetoresistance in the type-II Dirac semimetals $A_x$PdTe${}_2$ (\textit{A} = Cu, Ag)