Volume 116, Number 2, October 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 December 2016|
A mechanism for weak itinerant antiferromagnetism: Mirrored van Hove singularities
Department of Physics, University of California - Davis, CA 95616, USA
Received: 28 September 2016
Accepted: 7 November 2016
Unlike the other prominent macroscopic spin-paired quantum state, superconductivity, where the focus is on the strongest coupling within a class, untuned weak magnetism presents an intellectual frontier where electronic structure, magnetic coupling, and (quantum and thermal) fluctuations provide a platform for unconventional phenomena. With a strong van Hove singularity (vHs) at the Fermi energy, TiAu (with no magnetic element) is highly unstable toward ferromagnetism, yet orders antiferromagnetically at a wave vector unrelated to Fermi surface nesting. We show that mirrored vHs provide the long-wavelength, low-frequency fluctuations characteristic of a wFM rather than that of a conventional wAFM, whereby wAFM competes on equal terms with wFM for the broken symmetry ordered state. Peierls-like energy gain from cell doubling can help promote wAFM, which is evident in TiAu.
PACS: 75.10.-b – General theory and models of magnetic ordering / 71.20.-b – Electron density of states and band structure of crystalline solids / 71.20.Be – Transition metals and alloys
© EPLA, 2016
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