Magnetic properties and electrical resistivity of NaV 6 O 11 single crystal have been investigated. Magnetic transition was observed at 64.2 K. This oxide having a hexagonal crystal structure exhibited a uniaxial magnetic anisotropy with the easy axis of magnetization parallel to [001]. The spontaneous magnetization at 5 K was 1.7µ B per formula unit. The resistivity perpendicular to [001] showed an anomaly at the Curie temperature similar to that of ferromagnetic metals, while that parallel to [001] showed no such anomaly. This behavior suggests the itinerant character of d electrons.
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Uchida et al. (1991) studied this question.