Autor: |
Yang, H., Hooda, M. K., Yadav, C. S., Hrabovsky, D., Gauzzi, A., Klein, Y. |
Rok vydání: |
2021 |
Předmět: |
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Zdroj: |
Phys. Rev. B 103, 235105 (2021) |
Druh dokumentu: |
Working Paper |
DOI: |
10.1103/PhysRevB.103.235105 |
Popis: |
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. |
Databáze: |
arXiv |
Externí odkaz: |
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