Structure, magnetic order and excitations in the 245 family of Fe-based superconductors

TL;DR

This paper reviews the structural, magnetic, and excitations properties of the 245 family of Fe-based superconductors, highlighting phase diagrams, neutron scattering results, and theoretical models to understand their complex behaviors.

Contribution

It provides a comprehensive review of neutron scattering studies and phase diagrams for the 245 Fe-based superconductors, integrating experimental and theoretical insights.

Findings

Detailed phase diagrams of structural and magnetic properties

Neutron scattering data on magnetic excitations

Theoretical modeling using Heisenberg Hamiltonian

Abstract

Elastic neutron scattering simultaneously probes both the crystal structure and magnetic order in a material. Inelastic neutron scattering measures phonons and magnetic excitations. Here, we review the average composition, crystal structure and magnetic order in the 245 family of Fe-based superconductors and in related insulating compounds from neutron diffraction works. A three-dimensional phase-diagram summarizes various structural, magnetic and electronic properties as a function of the sample composition. A high pressure phase diagram for the superconductor is also provided. Magnetic excitations and the theoretic Heisenberg Hamiltonian are provided for the superconductor. Issues for future works are discussed.