Magnetoresistance scaling in the layered cobaltate Ca3Co4O9

Details Magnetoresistance scaling in the layered cobaltate Ca3Co4O9 Magnetoresistance scaling in the layered cobaltate Ca3Co4O9

2008-11-04

arxiv.org/abs/0811.0506v1

PHYSICAL REVIEW B 77, 245123 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.245123

We investigate the low temperature magnetic field dependences of both the resistivity and the magnetization in the misfit cobaltate Ca3Co4O9 from 60 K down to 2 K. The measured negative magnetoresistance reveals a scaling behavior with the magnetization which demonstrates a spin dependent diffusion mechanism. This scaling is also found to be consistent with a shadowed metalliclike conduction over the whole temperature range. By explaining the observed transport crossover, this result shed a new light on the nature of the elementary excitations relevant to the transport.

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