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  1. Article

    Open Access

    Calorimetric evidence for two phase transitions in Ba1−xKxFe2As2 with fermion pairing and quadrupling states

    Materials that break multiple symmetries allow the formation of four-fermion condensates above the superconducting critical temperature (Tc). Such states can be stabilized by phase fluctuations. Recently, a fermi...

    Ilya Shipulin, Nadia Stegani, Ilaria Maccari, Kunihiro Kihou in Nature Communications (2023)