Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)

Abstract

The electronic and magnetic properties of cobalt-based layered oxypnictides, LaCoOX (X = P, As), are investigated. LaCoOP and LaCoOAs show metallic type conduction, and the Fermi edge is observed by hard x-ray photoelectron spectroscopy. Ferromagnetic transitions occur at 43 K for LaCoOP and 66 K for LaCoOAs. Above the transition temperatures, temperature dependence of the magnetic susceptibility follows the Curie-Weiss law. X-ray magnetic circular dichroism (XMCD) is observed at the Co L2,3-edge, but not at the other edges. The calculated electronic structure shows a spin polarized ground state. These results indicate that LaCoOX are itinerant ferromagnets and suggest that their magnetic properties are governed by spin fluctuation.

16 pages, 9 figures, Physical Review B, in press. Received 17 February 2008. Accepted 29 May 2008

References in corpus (1)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems

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