Scattering rate collapse driven by a van Hove singularity in the Dirac semi-metal PdTe$_{2}$
| Autor: | van Heumen, Erik, Berben, Maarten, Neubrand, Linda, Huang, Yingkai |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review Materials 3, 114202 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.3.114202 |
| Popis: | We present optical measurements of the transition metal dichalcogenide PdTe$_{2}$. The reflectivity displays an unusual temperature and energy dependence in the far-infrared, which we show can only be explained by a collapse of the scattering rate at low temperature, resulting from the vicinity of a van Hove singularity near the Fermi energy. An analysis of the optical conductivity suggests that below 150 K a reduction in the available phase space for scattering takes place, resulting in long-lived quasiparticle excitations. We suggest that this reduction in phase space provides experimental evidence for a van Hove singularity close to the Fermi level. Our data furthermore indicates a very weak electron-phonon coupling. Combined this suggests that the superconducting transition temperature is set by the density of states associated with the van Hove singularity. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
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