Extremely Large Magnetoresistance in the Nonmagnetic MetalPdCoO2

Abstract

Extremely large magnetoresistance is realized in the nonmagnetic layered metal ${\mathrm{PdCoO}}_2$. In spite of a highly conducting metallic behavior with a simple quasi-two-dimensional hexagonal Fermi surface, the interlayer resistance reaches up to 35 000% for the field along the $[1\overline{1}0]$ direction. Furthermore, the temperature dependence of the resistance becomes nonmetallic for this field direction, while it remains metallic for fields along the [110] direction. Such severe and anisotropic destruction of the interlayer coherence by a magnetic field on a simple Fermi surface is ascribable to orbital motion of carriers on the Fermi surface driven by the Lorentz force, but seems to have been largely overlooked until now. DOI: http://dx.doi.org/10.1103/PhysRevLett.111.056601 © 2013 American Physical Society