X-ray techniques have been used for more than a century to study the atomic and electronic
structure in practically any type of material. The advent of correlated electron systems, in …

This article reviews the physics of multipolar interactions and multipolar order in f-electron
systems, using the actinide dioxides as a paradigm. In the past few years, these apparently …

Competition between magnetism and the kinetic energy of mobile carriers (typically holes) in
doped antiferromagnets may lead to 'stripe'phases,,,, which are charged rivers separating …

The occupation of d orbitals controls the magnitude and anisotropy of the inter-atomic
electron transfer in transition-metal oxides and hence exerts a key influence on their …

Resonant (elastic) soft x-ray scattering (RSXS) offers a unique element, site and valence
specific probe to study spatial modulations of charge, spin and orbital degrees of freedom in …

We review some recent advances in the use of optical fields at terahertz frequencies to drive
the lattice of complex materials. We will focus on the control of low energy collective …

The origin of nematicity in FeSe remains a critical outstanding question towards
understanding unconventional superconductivity in proximity to nematic order. To …

The few electrons in valence states of a material participate in many of its physical
properties, including both structural and transport properties. In the diffraction of X-rays, or …

Femtosecond midinfrared pulses are used to directly excite the lattice of the single-layer
manganite La 0.5 Sr 1.5 MnO 4. Magnetic and orbital orders, as measured by femtosecond …

Soft x-ray resonant scattering at the Ni L 2, 3 edges is used to test models of magnetic-and
orbital-ordering below the metal-insulator transition in NdNiO 3. The large branching ratio of …