Spin transitions in a series of FeII molecular complexes induced by a strong-pulsed magnetic field

The Spin Crossover Phenomenon Under High Magnetic Field

“…The irreversible process was obviously limited by the kinetic nature of the experiment. Later, by using metal-diluted complexes [Fe x Ni (1x) (btr) 2 (NCS) 2 ]·H 2 O under 32 T pulsed field we observed a clear correlation between the cooperativity of the thermal transition and the dynamics of the triggering process [21,22].…”

“…Fig. 7 [Fe x Ni (1-x) (btr) 2 (NCS) 2 ]·H 2 O: variation of the HS molecular fraction versus temperature (left panels) and vs magnetic field applied at different temperatures on the T" branch (right panels) for x=0.33 (3a) (after [21]) and x=0.8 (3b) (after [22])…”

“…The latter is quantitatively expressed through the ratio of the mean field interaction parameter and the transition temperature: J/k B T 1/2 . The dotted line is a guideline (after [22]) Applying a magnetic field of 32 T in the ascending branch of the hysteresis loop, as shown in Fig. 10, leads to an irreversible and quasi-complete S=1/2!S=3/2 transition [23].…”

“…For spin crossover complexes the possibility of switching between the HS and LS states can be achieved by a thermal, optical, pressure or magnetic perturbation [5,19,20] see also [21][22][23].…”

High Field Magnetization and ESR Measurements on a Spin-Crossover Complex

“…So far, some groups have investigated the transition under an external high magnetic field. 2,3) Since the HS state has a larger magnetic moment than the LS state, the Zeeman energy for the HS is larger than the one for the LS state. Therefore, it is expected that the transition from the LS to the HS state can be induced by applying the high magnetic field.…”