Gianluca A. Artioli

Phase Diagram of NdFeAsO1−xFx: Essential Role of Chemical Composition

In this Article, we provided the complete phase diagram of NdFeAsO(1-x)F(x) solid solution as a function of electron doping thanks to the careful determination of F- and O-content and phase content. We gave direct evidence of the source of F-depletion in the superconducting main phase, that is, the formation of oxyfluoride spurious phase. The approach reported in this work clearly showed that to give reliable results on these complex new superconducting materials, a rigorous control of the chemical composition of the considered phases has to be carried out.

Combined experimental and computational study of the pressure dependence of the vibrational spectrum of solid picene C22H14

We present high-quality optical data and density functional perturbation theory calculations for the vibrational spectrum of solid picene (C

Control of F-doping in pnictide high-temperature superconductors.

_{22}

Evidence for photo-induced monoclinic metallic VO2 under high pressure

H

Correlation between Deposition Parameters and Hydrogen Production in CuO Nanostructured Thin Films.

_{14}

HOMO-LUMO transitions in solvated and crystalline picene

) under pressure up to 8 GPa. First-principles calculations reproduce with a remarkable accuracy the pressure effects on both frequency and intensities of the phonon peaks experimentally observed . Through a detailed analysis of the phonon eigenvectors, We use the projection on molecular eigenmodes to unambiguously fit the experimental spectra, resolving complicated spectral structures, in a system with hundreds of phonon modes. With these projections, we can also quantify the loss of molecular character under pressure. Our results indicate that picene, despite a \sim 20 % compression of the unit cell, remains substantially a molecular solid up to 8 GPa, with phonon modes displaying a smooth and uniform hardening with pressure. The Grueneisen parameter of the 1380 cm^{-1} a_1 Raman peak (

Superconductivity in metal-intercalated aromatic hydrocarbons

\gamma_p=0.1

Local Structural Investigation of SmFeAsO1−xFx High Temperature Superconductors

) is much lower than the effective value (

Preparation of (substituted) picenes via solar light-induced Mallory photocyclization

\gamma_d=0.8

Vibrational spectrum of solid picene (C22H14)

) due to K doping. This is an indication that the phonon softening in K doped samples is mainly due to charge transfer and electron-phonon coupling.