Theoretical study of impurity-induced magnetism in FeSe

Abstract

Experimental evidence suggests that FeSe is close to a magnetic instability, and recent scanning tunneling microscopy (STM) measurements on FeSe multilayer films have revealed stripe order locally pinned near defect sites. Motivated by these findings, we perform a theoretical study of locally induced magnetic order near nonmagnetic impurities in a model relevant for FeSe. We find that relatively weak repulsive impurities indeed are capable of generating short-range magnetism, and explain the driving mechanism for the local order by resonant eg-orbital states. In addition, we investigate the importance of orbital-selective self-energy effects relevant for Hund's metals, and show how the structure of the induced magnetization cloud gets modified by orbital selectivity. Finally, we make concrete connection to STM measurements of iron-based superconductors by symmetry arguments of the induced magnetic order, and the basic properties of the Fe Wannier functions relevant for tunneling spectroscopy.

arXiv comment10 pages, 4 figures

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Cited by in corpus (15)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
• Singular magnetic anisotropy in the nematic phase of FeSe
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Supercurrents and spontaneous time-reversal symmetry breaking by nonmagnetic disorder in unconventional superconductors
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Local signatures of altermagnetism
• Impurity induced magnetic ordering in Sr${}_2$RuO${}_4$
• Time-reversal symmetry breaking from lattice dislocations in superconductors
• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
• Topological superconductivity driven by correlations and linear defects in multiband superconductors
• Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La${}_3$Ni${}_2$O${}_7$ Superconductors with interlayer pairing
• Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides