The effect of high pressure upon the valence transition in EuPd2Si2

The so-called 'valence transition' in EuPd2Si2 has been observed using energy-dispersive synchrotron X-ray powder diffraction at elevated pressures and is centred at 8 kbar. The estimated increase in valence at the transition is 0.2, and is associated with crossover of 4f and 6d/s bands.