Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$

Abstract

Neutron scattering has played a significant role in characterizing magnetic and structural correlations in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ and their connections with superconductivity. Here we review several key aspects of the physics of iron chalcogenide superconductors where neutron studies played a key role. These topics include the phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$, where the doping-dependence of structural transitions can be understood from a mapping to the anisotropic random field Ising model. We then discuss orbital-selective Mott physics in the Fe chalcogenide series, where temperature-dependent magnetism in the parent material provided one of the earliest cases for orbital-selective correlation effects in a Hund's metal. Finally, we elaborate on the character of local magnetic correlations revealed by neutron scattering, its dependence on temperature and composition, and the connections to nematicity and superconductivity.

15 pp, 16 figs

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Cited by in corpus (6)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Magnetic, superconducting, and topological surface states on Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Unconventional short-range structural fluctuations in cuprate high-$T_c$ superconductors
• Phase diagrams on composition-spread Fe${}_y$Te${}_{1-x}$Se${}_x$ films
• Magnetic molecular orbitals in MnSi
• Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$