Magnetic fluctuations and spin-spirals in single-layer FeSe

Abstract

The magnetic properties of monolayer FeSe films are investigated via first-principles spin-spiral calculations. Although the (pi,pi) collinear antiferromagnetic (CL-AFM) mode is lowest in energy, the spin-wave energy E(q) - which exhibits intrinsic non-Heisenberg behavior - is found to be extremely very flat over a large region of the two-dimensional Brillouin zone centered at the checkerboard antiferromagnetic (CB-AFM) q=0 configuration, giving rise to a sharp peak in the spin density of states. Considering the paramagnetic state as an incoherent average over spin-spiral states, we find that resulting electronic band states around the Fermi level closely resemble the bands of the CB-AFM configuration - not the CL-AFM one - and thus providing a natural explanation of the angle-resolved photoemission observations. The presence of the SrTiO3(001) substrate, both with and without interfacial oxygen vacancies, is found to reduce the energy difference between the CB-AFM and CL-AFM states and hence enhancing the CB-AFM-like fluctuations.

7 pages, 3 figures

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• Effects of charge doping and constrained magnetization on the electronic structure of an FeSe monolayer
• Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
• First-principles study of magnetic frustration in FeSe epitaxial films on SrTiO${}_3$

Cited by in corpus (14)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Superconductivity without inversion and time-reversal symmetries
• Odd-parity Magnetism Driven by Antiferromagnetic Exchange
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• On the interplay of paramagnetism and topology in the Fe-based High Tc Superconductors
• Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO${}_3$
• Multichannel superconductivity of monolayer FeSe on SrTiO${}_3$: Interplay of spin fluctuations and electron-phonon interaction
• Nodal topology in $d$-wave superconducting monolayer FeSe
• Tomonaga Luttinger liquid in the topological edge channel of multilayer FeSe
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• LaO as a candidate substrate for realizing superconductivity in FeSe epitaxial film
• Quantum spin models of commensurate $p$-wave magnets