Unconventional magnetic transition and transport behavior in Na0.75CoO2

Details Unconventional magnetic transition and transport behavior in Na0.75CoO2 Unconventional magnetic transition and transport behavior in Na0.75CoO2

2002-12-17

arxiv.org/abs/cond-mat/0212395v1

Physical Review B 67, 064406 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.064406

Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide, NaxCoO2. Only for x = 0.75, a magnetic transition of the second order was clearly detected at Tm ~ 22 K where an apparent specific-heat jump, an onset of extremely small spontaneous magnetization, and a kink in resistivity came in. Moreover large positive magnetoresistance effect was observed below Tm. These features of the transition strongly indicate the appearance of an unusual electronic state that may be attributed to the strongly-correlated electrons in Na0.75CoO2.

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