• Frantzeskakis, E.; Dai, J.; Bareille, C.; Rödel, T.C.; Güttler, M.; Ran, S.; Kanchanavatee, N.; Huang, K.; Pouse, N.; Wolowiec, C.T.; Rienks, E.D.L.; Lejay, P.; Fortuna, F.; Maple, M.B.; Santander-Syro, A.F.: From hidden order to antiferromagnetism: Electronic structure changes in Fe-doped URu2Si2. Proceedings of the National Academy of Sciences of the United States of America 118 (2021), p. e2020750118/1-6

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The transition of URu2Si2 to an ordered state below 17.5 K has been a puzzle of condensed matter physics for over 30 y, earning it the soubriquet of the hidden-order (HO) state. Intriguingly, pressure or doping can transform the HO into an antiferromagnetic (AFM) state, of well-known symmetry. Here, by angle-resolved photoemission spectroscopy, the electronic structure of URu2Si2 in the HO phase is directly compared with its AFM counterpart. This reveals topographically identical Fermi surfaces; however, they differ by the size of some of their pockets. The overall nonrigid change of the electronic structure across the AFM/HO phase boundary indicates that a change in the interaction strength between states near the Fermi level is essential to stabilize the HO state.