New Form of Magnetism

  • Author: Marek Czykanski
  • Published: 20 February 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Nature Communications/Springer Nature Limited
thumbnail image: New Form of Magnetism

A magnetic field is created in a material when the spins of the atoms all point in the same direction. With non-magnetic materials, the spins are undirected and their effects cancel each other out.

About 50 years ago, it was theoretically postulated that a magnetic moment can also occur temporarily in a non-magnetic material [1]. This moment is formed by so-called spin excitons. These are short-lived quasiparticles that arise from the interaction of electrons. Normally, these spin excitons disappear very quickly. However, the theory says that many of them can stabilize each other and then catalyze the emergence of even more spin excitons. So far, this has not been observed experimentally.

L. Andrew Wray, New York University, USA, and colleagues have shown by means of X-ray scattering, neutron scattering, and accompanying modeling that magnetic exciton fields occur at comparatively high temperatures in the uranium antimony compound USb2. USb2 has disordered spins and is usually not magnetic.

According to the researchers, this uranium compound could be the first example of such an exciton magnet above ultracold conditions, a so-called singlet ground state magnet. This would be proof that the theory of singlet-based magnetism is correct. In addition, this finding could be useful for new types of magnetic data storage for computers.



Article Views: 1307

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH