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MM: Fachverband Metall- und Materialphysik
MM 21: Transport - Ions and Electrons
MM 21.5: Vortrag
Dienstag, 17. März 2020, 11:15–11:30, IFW B
Investigation of the universal scattering rate in PdCrO2 by high energy electron irradiation — •Elina Zhakina1,3, Philippa McGuinness1,3, Seunghyun Khim1, Veronika Sunko1, Andrew Mackenzie1,3, and Marcin Konczykowski2 — 1Max Planck Institute for Chemical physics of solids, Dresden, Germany — 2Laboratoire des Solides Irradies, Ecole Polytechnique, Palaiseau, France — 3School of Physics and Astronomy University of St Andrews, North Haugh St Andrews, Scotland
PdCrO2 belongs to the delafossite family of extremely pure triangular lattice metals. The CrO2 layers are Mott insulating, and order antiferromagnetically below 37.5K. The resistivity of PdCrO2 is linear in temperature above 150 K. This is in contrast to the non-magnetic sister compound PdCoO2, indicating that it is a consequence of the coupling to the Mott-insulating layer. Intriguingly, in the region of the T-linear resistivity, the scattering rate per kelvin is well approximated by the ratio of fundamental constants, kB /h. Numerous other materials reveal the same slope in the T-linear region, in spite of large differences in the microscopic origins of the scattering. To investigate the universal behaviour of the scattering rate, we conducted a systematic study of the influence of point defects on the resistivity of PdCrO2, the results of which we report here. We introduced point defects to microstructures of PdCrO2 by irradiating them with high-energy electrons. Comparing the results with those on PdCoO2 , we confirm that the increase in the resistivity is dominated by point defects in conductive Pd layers.