Magnetoresistance scaling in the layered cobaltate Ca 3 Co 4 O 9

Abstract : We investigate the low-temperature magnetic-field dependences of both the resistivity and the magnetization in the misfit cobaltate Ca 3 Co 4 O 9 from 60 K down to 2 K. The measured negative magnetoresistance reveals a scaling behavior with the magnetization which demonstrates a spin dependent scattering 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 sheds a new light on the nature of the elementary excitations relevant to the transport.
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P. Limelette, J. Soret, H. Muguerra, D. Grebille. Magnetoresistance scaling in the layered cobaltate Ca 3 Co 4 O 9. Physical Review B : Condensed matter and materials physics, American Physical Society, 2008, 77 (24), ⟨10.1103/PhysRevB.77.245123⟩. ⟨hal-01870078⟩

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