Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies

Details Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies Non-magnetic insulator state in Na1CoO2 and phase separation of Na vacancies

2005-09-13

arxiv.org/abs/cond-mat/0509319v1

Phys. Rev. Lett. 95, 186405 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in PRL

Scientific paper

10.1103/PhysRevLett.95.186405

Crystallographic, magnetic and NMR properties of a NaxCoO2 single crystal with x~1 are presented. We identify the stoichiometric Na1CoO2 phase, which is shown to be a non-magnetic insulator, as expected for homogeneous planes of Co3+ ions with S=0. In addition, we present evidence that, because of slight average Na deficiency, chemical and electronic phase separation leads to a segregation of Na vacancies into the well-defined, magnetic, Na0.8CoO2 phase. The importance of phase separation is discussed in the context of magnetic order for x~0.8 and the occurrence of a metal-insulator transition for x->1.

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