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

P. Limelette (1) , J. C Soret (1) , H. Muguerra (2) , D. Grebille (2)

1 LEMA - Laboratoire d'Electrodynamique des Matériaux Avancés
2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

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.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

P. Limelette, J. C 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 (1998-2015), 2008, 77 (24), ⟨10.1103/PhysRevB.77.245123⟩. ⟨hal-01870078⟩