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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

190 Citations (Scopus)


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.

Original languageEnglish
Article number064406
Pages (from-to)644061-644065
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
Publication statusPublished - 1 Feb 2003
MoE publication typeA1 Journal article-refereed

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