title: An itinerant antiferromagnetic metal without magnetic constituents.
abstract: The origin of magnetism in metals has been traditionally discussed in two diametrically opposite limits: itinerant and local moments. Surprisingly, there are very few known examples of materials that are close to the itinerant limit, and their properties are not universally understood. In the case of the two such examples discovered several decades ago, the itinerant ferromagnets ZrZn2 and Sc3In, the understanding of their magnetic ground states draws on the existence of 3d electrons subject to strong spin fluctuations. Similarly, in Cr, an elemental itinerant antiferromagnet with a spin density wave ground state, its 3d electron character has been deemed crucial to it being magnetic. Here, we report evidence for an itinerant antiferromagnetic metal with no magnetic constituents: TiAu. Antiferromagnetic order occurs below a Néel temperature of 36 K, about an order of magnitude smaller than in Cr, rendering the spin fluctuations in TiAu more important at low temperatures. This itinerant antiferromagnet challenges the currently limited understanding of weak itinerant antiferromagnetism, while providing insights into the effects of spin fluctuations in itinerant-electron systems.
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
authors.forename: E
authors.initials: E
authors.lastname: Svanidze
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
authors.forename: Jiakui K
authors.initials: JK
authors.lastname: Wang
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: T
authors.initials: T
authors.lastname: Besara
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: L
authors.initials: L
authors.lastname: Liu
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: T
authors.initials: T
authors.lastname: Siegrist
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: B
authors.initials: B
authors.lastname: Frandsen
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
authors.forename: Andriy H
authors.initials: AH
authors.lastname: Nevidomskyy
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Monika B
authors.initials: MB
authors.lastname: Gamża
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.|Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.
authors.forename: M C
authors.initials: MC
authors.lastname: Aronson
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Uemura
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA.
authors.forename: E
authors.initials: E
authors.lastname: Morosan