Abstract
Extremely large magnetoresistance (XMR) was recently discovered in , triggering extensive research on this material regarding the XMR origin. Since is a layered compound with metal layers sandwiched between adjacent insulating chalcogenide layers, this material has been considered to be electronically two-dimensional (2D). Here we report two new findings on : (1) is electronically 3D with a mass anisotropy as low as 2, as revealed by the 3D scaling behavior of the resistance with , being the magnetic field angle with respect to the axis of the crystal and being the mass anisotropy and (2) the mass anisotropy varies with temperature and follows the magnetoresistance behavior of the Fermi liquid state. Our results not only provide a general scaling approach for the anisotropic magnetoresistance but also are crucial for correctly understanding the electronic properties of , including the origin of the remarkable “turn-on” behavior in the resistance versus temperature curve, which has been widely observed in many materials and assumed to be a metal-insulator transition.
- Received 25 May 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.046602
© 2015 American Physical Society
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Electrons Travel Between Loosely Bound Layers
Published 22 July 2015
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