The physics of quantum materials is dictated by many-body interactions and mathematical
concepts such as symmetry and topology that have transformed our understanding of matter …

Negative thermal expansion (NTE) is an intriguing physical property of solids, which is a
consequence of a complex interplay among the lattice, phonons, and electrons …

Kamihara and coworkers' report of superconductivity at T c= 26 K in fluorine-doped
LaFeAsO inspired a worldwide effort to understand the nature of the superconductivity in this …

The recently discovered FeAs-based superconductors are a new, promising set of materials
for technological and basic research. They offer transition temperatures as high as 55 K as …

In this review, we present a summary of experimental studies of magnetism in Fe-based
superconductors. The doping dependent phase diagram shows strong similarities to the …

We report the results of a systematic investigation of the phase diagram of the iron-based
superconductor Ba 1− x K x Fe 2 As 2 from x= 0 to x= 1.0 using high-resolution neutron and …

Inelastic neutron scattering measurements on single crystals of superconducting BaFe 1.84
Co 0.16 As 2 reveal a magnetic excitation located at wave vectors (1/2 1/2 L) in tetragonal …

Among various parent compounds of iron pnictide superconductors, EuFe 2 As 2 stands out
due to the presence of both spin density wave of Fe and antiferromagnetic (AFM) ordering of …

Here we present a combined study of the slightly underdoped novel pnictide superconductor
Ba 1-x K x Fe 2 As 2 by means of x-ray powder diffraction, neutron scattering, muon-spin …

Single-crystal neutron diffraction is used to investigate the magnetic and structural phase
diagrams of the electron-doped superconductor Ba (Fe 1− x Co x) 2 As 2. Heat-capacity and …