Phys.org October 10, 2023
The interplay between magnetism and electronic band topology enriches topological phases and has promising applications. However, the role of topology in magnetic fluctuations has been elusive. A team of researchers in the US (MIT, Harvard University, Argonne National Laboratory, SLAC National Accelerator Laboratory, Oak Ridge National Laboratory, Brookhaven National Laboratory, industry, Rice University) has shown evidence for topology stabilized magnetism above the magnetic transition temperature in magnetic Weyl semimetal candidate CeAlGe. They had clear indication of the presence of locally correlated magnetism within a narrow temperature window well above the thermodynamic magnetic transition temperature. Effective field theory showed that this topology stabilized order was wavevector dependent and could be stabilized when the interband Weyl fermion scattering was dominant. According to the researchers their work highlights the role of electronic band topology in stabilizing magnetic order even in the classically disordered regime… read more. Open Access TECHNICAL ARTICLE
Weyl-mediated incommensurate magnetism in CeAlGe. Credit: Nature Communications volume 14, Article number: 5182 (2023)Â