Dresden 2017 – wissenschaftliches Programm
TT 79.1: Vortrag
Freitag, 24. März 2017, 09:30–09:45, HSZ 03
Search for magneto-hydrodynamics in the delafossite metals PdCoO2 and PtCoO2 — •Nabhanila Nandi1, Pallavi Kushwaha1, Seunghyun Khim1, Philip J.W. Moll1, Burkhard Schmidt1, Thomas Scaffidi2, Markus König1, and Andrew P. Mackenzie1,3 — 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany — 2Department of Physics, University of California, Berkeley, California 94720, USA — 3Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
Electrical resistance is conventionally determined by the momentum-relaxing scattering of electrons by the host solid and its excitations. Hydrodynamic fluid flow through channels, in contrast, is determined by geometrical factors, boundary scattering and the viscosity of the fluid, which is governed by momentum-conserving internal collisions. In almost all known materials, however, the signatures of viscosity in electron flow cannot be resolved, because the rate of momentum-relaxing collisions dominates that of the momentum-conserving ones that give the viscous term. In previously published work, we reported experimental evidence that there is a regime in restricted channels of the ultra-pure two-dimensional delafossite metal PdCoO2 in which the resistance has a large viscous contribution. In this talk I will report on our current work in which we extend our experiments to magneto-hydrodynamics, discussing data both from PdCoO2 and a second delafossite metal, PtCoO2.