title: HfMnSb2 : A Metal-Ordered NiAs-type Pnictide with a Conical Spin Order.
abstract: The NiAs-type structure is one of the most common structures in solids, but metal order has been almost exclusively limited to chalcogenides. The synthesis of HfMnSb2 is reported with a novel metal-ordered NiAs-type structure. HfMnSb2 undergoes a conical spin order below 270 K, in marked contrast to conventional magnetic order observed in NiAs-type pnictides. We argue that the layered arrangement of Hf and Mn makes it a quasi 2D magnet, where the Mn layers with localized magnetic moments (Mn(2+) ; S=5/2) can interact only through RKKY interactions, instead of metal-metal bonding that is otherwise dominant for typical NiAs-type pnictides. This result suggests that controlling order-disorder in NiAs-type pnictides enables a study of 2D-to-3D crossover behavior in itinerant magnetic system.
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
authors.forename: Taito
authors.initials: T
authors.lastname: Murakami
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
authors.forename: Cédric
authors.initials: C
authors.lastname: Tassel
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takatsu
authors.affiliation: Institut Laue-Langevin, 6, rue Jules Horowitz, Grenoble, 38000, France.
authors.forename: Clemens
authors.initials: C
authors.lastname: Ritter
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
authors.forename: Yoshitami
authors.initials: Y
authors.lastname: Ajiro
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan. kage@scl.kyoto-u.ac.jp.
authors.forename: Hiroshi
authors.identifier: 0000-0002-3911-9864
authors.initials: H
authors.lastname: Kageyama
keywords: NiAs structure; cation order; conical spin order; pnictides; solid-state structures