Suppression of ballistic effects in the ultra-pure delafossite PtCoO<sub>2 </sub>via high-energy electron irradiation
ORAL
Abstract
PtCoO2 is a layered oxide delafossite material which has a hexagonal, single-band Fermi surface. This ultrapure metal is extremely conductive, with a low-temperature mean free path of up to 5 μm [1]. Due to these properties, novel low-temperature ballistic effects have been demonstrated in the magnetoresistance of micron-scale ultrapure delafossite devices [2]. To determine the sensitivity of the ballistic behavior to disorder, we have used 2.5 MeV electron irradiation to introduce point-defect impurities into PtCoO2 microstructures. This reduces the mean free path and therefore suppresses the ballistic phenomena. Surprisingly, these effects remain, in a weaker form, at an impurity level significantly higher than would be expected from the usual limits of the ballistic regime.
[1] Kushwaha, P. et al. Science Advances 1, e1500692–e1500692 (2015)
[2] Bachmann, M. et al. arXiv:1902.03769
[1] Kushwaha, P. et al. Science Advances 1, e1500692–e1500692 (2015)
[2] Bachmann, M. et al. arXiv:1902.03769
*The authors acknowledge support from the Max Planck Society. PM and VS thank EPSRC for PhD studentship support through grant number EP/L015110/1. The irradiation was performed at LSI at the Ecole Polytechnique and was supported by the EMIR network.
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Presenters
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Philippa McGuinness
- Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
- Max Planck Institute for Chemical Physics of Solids