X-ray absorption and optical spectroscopy studies of (Mg$_{1-x}$Al$_x$)B$_2$

X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system

X-ray Dichroism and the Pseudogap Phase of Cuprates

X-ray diffraction measurements of the c-axis Debye-Waller factors of YBa2Cu3O7 and HgBa2CaCu2O6

X-ray Photoelectron Spectroscopy Studies of MgB2 for Valence State of Mg

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB2+x

X-ray Photoemission Study of MgB2

X-ray Photoemission Study of the Infinite-Layer Cuprate Superconductor Sr0.9La0.1CuO2

X-ray spectra and electronic structure of FeAs superconductors

X-Ray-Diffraction Study of Charge-Density-Waves and Oxygen-Ordering in YBa2Cu3O6+x Superconductor

XPS as a Probe of Gap Opening in Many Electron Systems

XY ring-exchange model on the triangular lattice