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1 2003

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The study of the spin transition process in Na[Fe(Th-Sa)2] by electron paramagnetic resonance

Yablokov Y. V., Zelentsov V. V., Augustyniak-Jabłokow M., Krupska A., Mroziński J.

Materials Science

2003

Vol. 21, No. 2

215-223

The crossover phenomenon in Na[Fe(Th-Sa)2], a representative of a large class of the Fe(III) thiosemi-carbazonates, was examined by X-band EPR in temperatures 80 - 300°K and magnetisation of a polycrystalline sample was collected in the temperature range 1.8 - 300 K. The main results are as follows:- The appearance of LS complexes is requires thermal population of the 2A term but the transition process is ruled by other factors.- The LS complexes formed are not statistically distributed among the HS ones but tend to assemble in restricted spaces of the crystal lattice (domains) in which both short-range and long-range interactions of the complexes occur. - The increase in the cooperative interactions between the LS complexes and the enlargement of domains occur gradually with two jump changes. Each of the jumps has different character; the first is related to a redistribution of the complexes in domains and the other to a rapid increase in the LS phase volume.