Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Spin: Transport, Orbitronics and Hall Effects II

MA 54.6: Talk

Thursday, March 19, 2020, 16:30–16:45, HSZ 403

New Interpretation of the High-field Magnetoresistance of Graphite — •Christian Eike Precker and Pablo David Esquinazi — Division of Superconductivity and Magnetism, Felix Bloch Institute, University of Leipzig, Leipzig, Germany.

The study of electrical properties in graphite shows that every sample exhibits differences between each other due to the contribution of 2D interfaces that are not homogeneously distributed. For thick enough samples, where the contribution of 2D interfaces always takes place, the magnetic field dependence shows qualitatively the same behavior, namely: at low fields the samples show a positive magnetoresistance, reaching a maximum at some field, which is sample dependent (normally between 15 T and 30 T). At fields above that maximum a negative magnetoresistance appears. At higher fields (B ∼ 40 T), electronic phase transitions mounted on the negative magnetoresistance appear. With a parallel resistance model we can clarify several details of this complicated behavior. Our results indicate that the high conducting 2D interfaces are the main reason for the behavior observed in the high field magnetoresistance of graphite.