Theoretical model for the extreme positive magnetoresistance
Abstract
We present a model for the positive extreme magnetoresistance (XMR), recently observed in a plethora of metallic systems, such as PtSn4, PtBi2, PdCoO2, WTe2, NbSb2, NbP, TaSb2, LaSb, LaBi, ZrSiS and MoTe2. The model is an extension of our earlier work on positive giant magnetoresistance, and uses an elaborate diagrammatic formulation. XMR is a bulk effect (not a surface effect), due to the dramatic sensitivity of the conductivity to the finite magnetic field H. This is possible at low temperatures, in the presence of finite disorder elastic spin scattering, and for a special value, predicted from the theory, of the material-dependent effective Coulomb repulsion. Good agreement with experiments is obtained. According to our model XMR is higher in cleaner samples, and anisotropic with regards to the direction of H. We discuss in particular compounds containing the elements Pt, Sc, and Rh.
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