Observation of an asymmetry in the thermal hysteresis loop at the scale of a single spin-crossover particle
Language
en
Article de revue
This item was published in
Chemical Physics Letters. 2009, vol. 470, n° 1-3, p. 131-135
Elsevier
English Abstract
We have studied the spin-crossover phenomenon of single isolated micro-particles using a Differential Interference Microscope (DIC) operating in transmission mode. For that we have selected the [Fe(NH<sub>2</sub>-trz)<su ...Read more >
We have studied the spin-crossover phenomenon of single isolated micro-particles using a Differential Interference Microscope (DIC) operating in transmission mode. For that we have selected the [Fe(NH<sub>2</sub>-trz)<sub>3</sub>]Br<sub>2</sub>-2.5H<sub>2</sub>O coordination polymer complex well-known to exhibit, at room temperature, a spin transition with a large thermal hysteresis loop. The comparison of the thermal hysteresis loop of several isolated micro-particles demonstrates some heterogeneity and also an obvious asymmetry of the cycle. The warming branch clearly appears more abrupt than the cooling branch. We also report some correlations between the threshold temperature and the size of the particles.Read less <
Italian Keywords
Differential Interference Microscope
Polymer
Particles
Spin transition
Origin
Hal imported