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Solids with competing interactions often undergo complex phase transitionswith a variety of long-periodic modulations. Among such transition, devil'sstaircase is the most complex phenomenon, and for it, CeSb is the most famousmaterial, where a number of the distinct phases with long-periodicmagnetostructures sequentially appear below the Neel temperature. An evolutionof the low-energy electronic structure going through the devil's staircase isof special interest, which has, however, been elusive so far despite the40-years of intense researches. Here we use bulk-sensitive angle-resolvedphotoemission spectroscopy and reveal the devil's staircase transition of theelectronic structures. The magnetic reconstruction dramatically alters the banddispersions at each transition. We moreover find that the well-defined bandpicture largely collapses around the Fermi energy under the long-periodicmodulation of the transitional phase, while it recovers at the transition intothe lowest-temperature ground state. Our data provide the first direct evidencefor a significant reorganization of the electronic structures and spectralfunctions occurring during the devil's staircase.

Devil's staircase transition of the electronic structures in CeSb