Phys. Rev. B 67, 064406 (2003) [5 pages]Unconventional magnetic transition and transport behavior in Na0.75CoO2Received 27 August 2002; revised 2 December 2002; published 6 February 2003 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∼22K 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.064406
DOI:
10.1103/PhysRevB.67.064406
PACS:
75.30.Kz, 71.30.+h, 72.15.Eb
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