Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Topological Superconductors

TT 38.3: Vortrag

Mittwoch, 18. März 2020, 11:45–12:00, HSZ 103

Transport study on bulk PtBi2 and Pt1−xRhxBi2 at very low temperature — •Valentin Labracherie, Arthur Veyrat, and Joseph Dufouleur — Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01069 Dresden, Germany

Weyl Semimetals are a new class of material with chiral spin texture discovered in the last decade. They host quasiparticles with linear excitations, the Weyl fermions, which have definite spin chirality. These bulk states come as pairs of Dirac cones connected to each other at their interface with some trivial materials. Weyl fermions are expected to exhibit new effects like Fermi arcs and chiral anomaly for which electrons are pumped from one cone to the other, breaking the conservation of the chiral charge. Due to that, we have the appearance of a planar hall effect and anisotropic negative magnetoresistance when the electrical and magnetic field are aligned.

Several candidates to Weyl semimetal have also shown superconducting states at very low temperature and a lot of efforts has been made to see if these superconducting states is link to topology or not. I will present here transport measurement on PtBi2, a Weyl semimetal which show a superconducting state at 0.6K and we investigate the effect of Rh doping on its superconducting properties.

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