Coherent vs incoherent interlayer transport in layered metals
J. Wosnitza, J. Hagel, J. S. Qualls, J. S. Brooks, E. Balthes, D. Schweitzer, J. A. Schlueter, U. Geiser, J. Mohtasham, R. W. Winter, G. L. Gard
Abstract
The magnetic-field, temperature, and angular dependence of the interlayer magnetoresistance of two different quasi-two-dimensional (2D) organic superconductors is reported. For κ-(BEDT-TTF)2I3 we find a well-resolved peak in the angle-dependent magnetoresistance at Θ= 90 (field parallel to the layers). This clear-cut proof for the coherent nature of the interlayer transport is absent for β''-(BEDT-TTF)2SF5CH2CF2SO3. This and the non-metallic behavior of the magnetoresistance suggest an incoherent quasiparticle motion for the latter 2D metal.
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