Iron with a large magnetic moment was widely believed to be harmful to the emergence of
superconductivity because of the competition between the static ordering of electron spins …

Iron-based superconductors are well known for their complex interplay between structure,
magnetism and superconductivity. FeSe offers a particularly fascinating example. This …

Four types of atomic-scale multipoles (electric, magnetic, magnetic toroidal, and electric
toroidal multipoles) give a complete set to describe arbitrary degrees of freedom for coupled …

This review shows the highlights of a 4-year-long research project supported by the
Japanese Government to explore new superconducting materials and relevant functional …

Recently, competing electronic instabilities, including superconductivity and density-wave-
like order, have been discovered in vanadium-based kagome metals A V3Sb5 (A= K, Rb …

The development of sensible microscopic models is essential to elucidate the normal-state
and superconducting properties of the iron-based superconductors. Because these …

Nematicity and magnetism are two key features in Fe-based superconductors, and their
interplay is one of the most important unsolved problems. In FeSe, the magnetic order is …

To understand the nematicity in Fe-based superconductors, nontrivial k dependence of the
orbital polarization [Δ E xz (k), Δ E yz (k)] in the nematic phase, such as the sign reversal of …

Predicting the properties of materials prior to their synthesis is of great importance in
materials science. Magnetic and superconducting materials exhibit a number of unique …

The present article reviews recent experimental investigations of spin dynamics in iron-
based superconductors and their parent compounds by means of inelastic neutron …