Unconventional magnetic transition and transport behavior in Na0.75CoO2

T. Motohashi; R. Ueda; E. Naujalis; T. Tojo; I. Terasaki; T. Atake; M. Karppinen; H. Yamauchi

doi:10.1103/PhysRevB.67.064406

Unconventional magnetic transition and transport behavior in Na0.75CoO2

Strongly Correlated Electrons 2009-11-07 v1

Authors: T. Motohashi , R. Ueda , E. Naujalis , T. Tojo , I. Terasaki , T. Atake , M. Karppinen , H. Yamauchi

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Abstract

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.

Keywords

Na0.75CoO2 magnetic transition transport behavior strongly-correlated electrons magnetoresistance

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@article{arxiv.cond-mat/0212395,
  title  = {Unconventional magnetic transition and transport behavior in Na0.75CoO2},
  author = {T. Motohashi and R. Ueda and E. Naujalis and T. Tojo and I. Terasaki and T. Atake and M. Karppinen and H. Yamauchi},
  journal= {arXiv preprint arXiv:cond-mat/0212395},
  year   = {2009}
}

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

Unconventional magnetic transition and transport behavior in Na0.75CoO2

Abstract

Keywords

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