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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)

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  2. No Access

    Article

    State with spontaneously broken time-reversal symmetry above the superconducting phase transition

    The most well-known example of an ordered quantum state—superconductivity—is caused by the formation and condensation of pairs of electrons. Fundamentally, what distinguishes a superconducting state from a nor...

    Vadim Grinenko, Daniel Weston, Federico Caglieris, Christoph Wuttke… in Nature Physics (2021)

  3. No Access

    Article

    A numerical study of planar arrays of correlated spin islands

    We analyze a system of interacting islands of XY spins on a triangular lattice. This model has been introduced a few years ago by Eley et al. [Nat. Phys. 8, 59 (2012)] to account for the phenomenology in experim...

    Ilaria Maccari, Andrea Maiorano, Enzo Marinari… in The European Physical Journal B (2016)