Abstract
We have investigated the structural properties of the photo-induced metastable phase of a Prussian blue analogue (Na0.42Co[Fe(CN)6]0.78·4.64H2O), which shows the photo-magnetization phenomenon, as revealed by means of the high angle-resolved synchrotron-radiation X-ray powder diffraction technique. We have found that (1) the structural domain size is larger than the quenched high-temperature phase and (2) the lattice constant a (=10.287(1) Å) is larger than that of the quenched phase (a=10.187(3) Å). These observations indicate that photo-excitation coherently increases the size of the photo-induced metastable region even at low temperature (91K<<Tc).
