In-plane ferromagnetism in charge-ordering Na₀.₅₅CoO₂
Wang, C. H. · Chen, X. H. · Wu, T. · Luo, X. G. · Wang, G. Y. · Luo, J. L.
Original · EN
The magnetic and transport properties are systematically studied on the single crystal Na₀.₅₅CoO₂ with charge ordering and divergency in resistivity below 50 K. A long-range ferromagnetic ordering is observed in susceptibility below 20 K with the magnetic field parallel to Co-O plane, while a negligible behavior is observed with the field perpendicular to the Co-O plane. It definitely gives a direct evidence for the existence of in-plane ferromagnetism below 20 K. The observed magnetoresistance (MR) of 30 % at the field of 6 T at low temperatures indicates an unexpectedly strong spin-charge coupling in triangle lattice systems.
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