New Ferromagnetic Chromium Chalcogenides, ACr5Te8 (A = K, Cs and Rb)
New pseudo-hollandite chromium tellurides, ACr5Te8 (A = K, Cs and Rb), have been synthesized. KCr5Te8 is isostructural (type-A; space group C2/m) to ACr5S8, while RbCr5Te8 and CsCr5Te8 crystallize in a different structure (type-B; space group C2/m). All compounds show ferromagnetic transition, in contrast to antiferromagnetic transition in pseudo-hollandite chromium sulfides and selenides. The ferromagnetism of ACr5Te8 would be related to long Cr-Cr distances, band structure or itinerancy.
J.-L. Bobet, B. Chevalier and D. Fruchart
S. Yamazaki and Y. Ueda, "New Ferromagnetic Chromium Chalcogenides, ACr5Te8 (A = K, Cs and Rb)", Solid State Phenomena, Vol. 170, pp. 17-20, 2011