High-pressure studies of quantum magnets via synchrotron x-rays

Intrinsic magnetic topological materials have attracted much attention as a platform to control topological phases by manipulating the magnetic configuration. In this work, static pressure is adopted to control the magnetic behaviors in selected Eu-based Dirac and Weyl semimetal candidates and magnetic Kagome lattice Fe₃Sn₂. The pressure responses of magnetism, evolution of crystal lattice, and electronic structures have been investigated on a microscopic scale using time-domain synchrotron Mössbauer spectroscopy, x-ray diffraction, and x-ray absorption combined with theoretical calculations. In Eu-based magnets, large enhancements in magnetic ordering temperature have been observed regardless of the valence state of Eu ions. On the other hand, in Kagome magnet Fe₃Sn₂ pressure suppresses the magnetism accompanied by a crystal structural transition. In this talk, the detailed findings on pressure-controlling of magnetism, valence, and crystal structure will be discussed.