Paper reporting flatband ferromagnetism in RbCo₂Se₂ is published in PRB, congrats to Jianwei!

Our paper on flat-band itinerant ferromagnetism in RbCo2Se2 is published in PRB:

https://journals.aps.org/prb/pdf/10.1103/PhysRevB.103.165105

RbCo₂Se₂ is isostructural to the intercalated high Tc iron-based superconductor RbFe₂Se₂. Via a combined ARPES, neutron, transport, and DFT study, we identify the origin of the ferromagnetic order in this material to be due to the tuning of a flatband near the Fermi level achieved via heavy electron-doping from RbFe₂Se₂. by the replacement of Fe by Co. Furthermore, we identify this flatband to be a common feature in the generic electronic structure of iron-based superconductors, and accessible in general via carrier doping.