Condensed Matter/Materials & Biological Physics Seminar with Wenli Bi on Controlling Topological Magnets

Eu-based magnetic materials with strong local magnetic moments have attracted much attention as intrinsic magnetic topological semimetal candidates, providing a platform to control topological states by manipulating magnetism. Here in this work, we apply pressure as an effective way to tune magnetic exchange interaction and the electronic states. Due to the small sample size in high-pressure studies using diamond anvil cells, it is technically challenging to characterize material physical properties. With the development of various synchrotron X-ray techniques (diffraction, scattering, and spectroscopy) combined with extreme sample environment (pressure, temperature), information on magnetic and electronic states can be obtained under pressure on a microscopic scale. In this talk, I will first introduce the application of synchrotron X-ray techniques in high pressure research, and then discuss our recent results on controlling magnetism, valence, and crystal structure in selected Eu-based topological magnetic materials.