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    Université de Fribourg

    Entropy and electronic orders of the three-orbital Hubbard model with antiferromagnetic Hund coupling

    Yue, Changming ; Hoshino, Shintaro ; Werner, Philipp

    In: Physical Review B, 2020, vol. 102, no. 19, p. 195103

    An antiferromagnetic Hund coupling in multiorbital Hubbard systems induces orbital freezing and an associated superconducting instability, as well as unique composite orders in the case of an odd number of orbitals. While the rich phase diagram of the half-filled three-orbital model has recently been explored in detail, the properties of the doped system remain to be clarified. Here, we...

    Université de Fribourg

    Nickelate superconductors: multiorbital nature and spin freezing

    Werner, Philipp ; Hoshino, Shintaro

    In: Physical Review B, 2020, vol. 101, no. 4, p. 041104

    Superconductivity with a remarkably high Tc has recently been found in Sr-doped NdNiO2 thin films. While this system bears strong similarities to the cuprates, some differences, such as a weaker antiferromagnetic exchange coupling and possible high-spin moments on the doped Ni sites have been pointed out. Here, we investigate the effect of Hund coupling and crystal field splitting in a simple...

    Université de Fribourg

    Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors

    Hoshino, Shintaro ; Werner, Philipp ; Arita, Ryotaro

    In: Physical Review B, 2019, vol. 99, no. 23, p. 235133

    Nonlocal order parameters in space-time are proposed to characterize the unconventional orbital-selective conducting state in fulleride superconductors, called the Jahn-Teller metal. In previous works, it has been argued that this state can be interpreted as a spontaneous orbital-selective Mott state, in which the electrons in two of the three t1u molecular orbitals are localized, while those...