HfMnSb2: A Metal‐Ordered NiAs‐type Pnictide with a Conical Spin Order. Issue 34 (29th June 2016)

• Record Type: Journal Article
• Authors: Murakami, Taito; Yamamoto, Takafumi; Tassel, Cédric; Takatsu, Hiroshi; Ritter, Clemens; Ajiro, Yoshitami; Kageyama, Hiroshi
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 34(2016)
• Page Start: 9877
• Page End: 9880
• Publication Date: 2016-06-29
• Subjects: cation order -- conical spin order -- NiAs structure -- pnictides -- solid-state structures; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201602066
• Languages: English
• ISSNs: 1433-7851

Abstract

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. Abstract : Metal order was obtained for the first time for a pnictide in HfMnSb2 having a NiAs structure. The two‐dimensional (2D) Mn network in HfMnSb2 leads to a novel conical spin order via an RKKY interaction, in contrast to conventional ferromagnetism found in NiAs‐type pnictides. This study suggests a new opportunity to study 2D‐to‐3D crossover in itinerant magnetic systems.