Spin crossover in the Prussian blue analogue FePt(CN)6 induced by pressure or X-ray irradiation

Abstract

The spin state of the Prussian blue analogue Fe^IIPt^IV(CN)₆ is investigated in response to temperature, pressure, and X-ray irradiation. While cooling to 10 K maintains the high-spin state of Fe^II, compression at ambient temperature induces a first-order spin-crossover (SCO) transition with a small hysteresis loop (p↑ = 0.8 GPa, p↓ = 0.6 GPa). In addition, the high-spin to low-spin transition can be initiated at lower pressure through increased X-ray irradiation. Our study highlights a cooperative SCO with moderate pressure in a porous Prussian blue analogue.