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Here we report an unconventional magnetic and transport phenomenon in alayered cobalt oxide, NaxCoO2. Only for x = 0.75, a magnetic transition of thesecond order was clearly detected at Tm ~ 22 K where an apparent specific-heatjump, an onset of extremely small spontaneous magnetization, and a kink inresistivity came in. Moreover large positive magnetoresistance effect wasobserved below Tm. These features of the transition strongly indicate theappearance of an unusual electronic state that may be attributed to thestrongly-correlated electrons in Na0.75CoO2.Comment: 5 pages, 6 figures, to appear in Phys. Rev.

physical review. b, condensed matter

Unconventional magnetic transition and transport behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi></mml:mrow><mml:mrow><mml:mn>0.75</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CoO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Unconventional magnetic transition and transport behavior inNa0.75CoO2