Abstract
Here we report an unconventional magnetic and transport phenomenon in a layered cobalt oxide Only for a magnetic transition of the second order was clearly detected at 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 These features of the transition strongly indicate the appearance of an unusual electronic state that may be attributed to the strongly correlated electrons in
- Received 27 August 2002
DOI:https://doi.org/10.1103/PhysRevB.67.064406
©2003 American Physical Society