Accueil > Agenda Scientifique

16 avril 2018: 2 événements

séminaire

  • FeSi : a novel building-block for iron-based superconductivity

    Lundi 16 avril 11:00-12:00 - Andres Cano - Institut Néel

    FeSi : a novel building-block for iron-based superconductivity

    Résumé : Iron-based superconductors represent the latest family of high-temperature unconventional superconductors [1]. In these systems, the Fe atom is invariably associated to pnictogen (As, P) or chalcogen (Se, S, Te) elements, with the only and intensively debated exception of YFe2Ge2 [2,3]. This circumstance raises the important fundamental question about the link between Fe-based superconductivity and the apparent need of these pnictogens and chalcogens [3]. At the same time, to escape from such harmful and/or comparatively scarce As- or Se-like elements is highly desirable for applications.
    In the talk I will introduce the new material LaFeSiH, which is first silicide that surpasses traditional pnictide and chalcogenide compounds as Fe-based superconductors, and discuss some of its physical properties [4]. These include superconductivity with onset at 11 K, and its coexistence with antiferromagnetic order and orthorhombic distortion already in the parent phase.
    [1] See e.g. H. Alloul and A. Cano (Guest Editors), Iron-based superconductors, C. R. Physique 17, 1 (2016) ; and the references therein.
    [2] J. Chen et al., Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2, PRL 116, 127001 (2016).
    [3] H. Kim et al., Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe2Ge2, Phil. Mag. 95, 804 (2015) ; D. Guterding et al., Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors, PRL 118, 017204 (2017).
    [4] F. Bernardini, G. Garbarino, A. Sulpice, M. Núñez-Regueiro, E. Gaudin, B. Chevalier, A. Cano, and S. Tencé, Iron-based superconductivity extended to the novel silicide hydride LaFeSiH, PRB 97 100504(R) (2018).

    Lieu : salle 315 3eme étage, aîle sud LPS, bât 510

    En savoir plus : FeSi : a novel building-block for iron-based superconductivity
  • Higher-order topological insulators - Titus Neupert

    Lundi 16 avril 14:00-15:00 -

    Higher-order topological insulators - Titus Neupert
    En savoir plus : Higher-order topological insulators - Titus Neupert