Thursday, July 25, 2013

1307.6503 (Hiroshi Takatsu et al.)

Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO2    [PDF]

Hiroshi Takatsu, Jun J. Ishikawa, Shingo Yonezawa, Harukazu Yoshino, Tatsuya Shishidou, Tamio Oguchi, Keizo Murata, Yoshiteru Maeno
Extremely large magnetoresistance is realized in the nonmagnetic layered metal PdCoO2. In spite of a highly conducting metallic behavior with a simple quasi-two-dimensional hexagonal Fermi surface, the interlayer resistance reaches up to 35000% for the field along the [1-10] 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.
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