Robust magnetism and crystal structure in Dirac semimetal EuMnBiunder high pressure.

Dirac materials offer exciting opportunities to explore low-energy carrier dynamics and novel physical phenomena, especially their interaction with magnetism. In this context, this work focuses on studies of pressure control on the magnetic state of EuMnBi, a representative magnetic Dirac semimetal, through time-domain synchrotron Mössbauer spectroscopy inEu. Contrary to the previous report that the antiferromagnetic order is suppressed by pressure above 4 GPa, we have observed robust magnetic order up to 33.1 GPa. Synchrotron-based x-ray diffraction experiment on a pure EuMnBisample shows that the tetragonal crystal lattice remains stable up to at least 31.7 GPa.