Powered by Indico
v3.2.3
Since the discovery of Fe-based superconductors (FeSCs) over a decade ago，analogue materials have also been keenly studied, due to unusual behaviors related the interplay between spin, orbital and lattice degrees of freedom. We found that replacing Fe ions in FeSCs with nonmagnetic ions (magnetic dilution) could lead to atomic ordering between the two species, resulting in low-dimensional semiconducting/insulating magnetic systems of Fe ions, as showcased by spin chains in NaFe0.5Cu0.5As and spin clusters in KFe0.8Ag1.2Te2. Using neutron scattering, we show that these systems invariably exhibit stripe-type magnetism associated with the FeSCs, although in different forms. Spin excitations in these materials also display remarkable similarities to those in FeSCs, offering a perspective for understanding the latter from localized degrees of freedom. Moreover, the rich material chemistry of magnetically-diluted Fe pnictides and chalcogenides renders them promising platforms for the materials exploration of low-dimensional correlated systems and unconventional superconductivity.
Yu Song obtained his PhD from Rice University in 2017, after receiving a Bachelor's degree from Zhejiang University in 2010. After a brief postdoctoral appointment at Rice University, he worked as a postdoctoral scholar at UC Berkeley from 2017 to 2020, and then joined the Department of Physics at Zhejiang University as a tenure-track researcher in 2020. Yu Song is interested in probing the structural and magnetic properties of novel materials using neutron and X-ray scattering, including the interplay between lattice, magnetism, and superconductivity in unconventional superconductors, magnetic excitations in heavy fermion metals and low-dimensional magnetism.
Zoom Link: https://zoom.com.cn/j/67661727474 Password: 123456