Dresden 2020 – wissenschaftliches Programm
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TT 66.14: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Angle-dependent magnetoresistance in ballistic semi-metals — •Felix Spathelf1,2, Benoît Fauqué2, and Kamran Behnia1 — 1Laboratoire de Physique et d’Étude des Matériaux (CNRS), ESPCI Paris, Université PSL, Paris, France — 2JEIP, USR 3573 CNRS, Collège de France, Université PSL, Paris, France
We performed electric transport measurements on bismuth and tungsten single crystals of several shapes, orientations and qualities in mangetic fields up to 13.8 T and at temperatures down to 2 K. In order to study the angular dependence of the magnetoresistance, we applied a current parallel to a high symmetry axis and rotated the magnetic field in the plane perpendicular to it. Due to the Fermi surface topology, the Lorentz force depends on the angle between the crystal axes and the applied magnetic field. Therefore, the magnetoresistance is angle-dependent.
We observed that at low temperatures the magnetoresistance loses also the symmetry of the underlying crystal. This happens in both bismuth, which has a very small Fermi surface, and tungsten, whose Fermi surface is much larger. The observed behaviour is thought to be connected to the shape of the sample , but at least in the case of bismuth, the sample shape cannot explain completely this effect .
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