An itinerant antiferromagnetic metal without magnetic constituents

E. Svanidze, Jiakui K. Wang, T. Besara, Lancui Liu, Q. Huang, T. Siegrist, B. Frandsen, J. W. Lynn, Andriy H. Nevidomskyy, Monika B. Gamża, M. C. Aronson, Y. J. Uemura and E. Morosan ()
Additional contact information
E. Svanidze: Rice University
Jiakui K. Wang: Rice University
T. Besara: National High Magnetic Field Laboratory, Florida State University
Q. Huang: NIST Center for Neutron Research, National Institute of Standards and Technology
T. Siegrist: National High Magnetic Field Laboratory, Florida State University
B. Frandsen: Columbia University
J. W. Lynn: NIST Center for Neutron Research, National Institute of Standards and Technology
Andriy H. Nevidomskyy: Rice University
Monika B. Gamża: Brookhaven National Laboratory
M. C. Aronson: Brookhaven National Laboratory
Y. J. Uemura: Columbia University
E. Morosan: Rice University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8701

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