Anomalous Quantum oscillations of magnetic topological semimetal EuCd2Sb2

Magnetic topological material is an ideal platform to explore the interplay between magnetism and electronic structures. In this talk, I will present the quantum oscillations study of an antiferromagnetic topological insulator EuCd2Sb2, which was proposed to be a magnetic Weyl semimetal in the field-induced ferromagnetic state. By comparing with the nonmagnetic analogue SrCd2Sb2, we discovered shifts of the peak and valley positions of quantum oscillations of EuCd2Sb2 as the temperature increases. We argued that this anomalous behavior is a consequence of the change of band structure due to the decrease of Eu magnetization.