Magnetic properties of the layered compoundLixV1−yMyS2(M=Fe,Co,orNi;x≤1.0,y≤0.33)

Abstract

Previous studies of the intercalated layered compounds ${\mathrm{Li}}_x{\mathrm{V}}_{1-y}{\mathrm{Fe}}_y{\mathrm{S}}_2$ for $0.1\le y\le 0.5$ are extended to lower concentrations, $0.1\ge y\ge 0.01$, and to substitutional metals other than Fe (Co and Ni). When no Li is intercalated ($x=0\mathrm{}$), no paramagnetic moments are observed independent of the substitutional metal (Fe, Co, or Ni), consistent with the previous report for Fe. At full intercalation ($x=1.0\mathrm{}$), the present results show that the substitutional metals develop a paramagnetic moment. This moment is less than that expected for the divalent state of the substitutional metals in an ionic environment, suggesting partial delocalization of the substitutional metal $d$ electrons into the conduction band of the metallic host.