Speaker
Prof.
Zbigniew Tomkowicz
(Institute of Physics, Jagiellonian University, Kraków)
Description
In the crystal structure of [Co(NCS)2(4-(4-chlorobenzyl) pyridine)2]n (abbr. ClBP) the Co(II) cations are octahedrally coordinated by two terminal ClBP ligands and four thiocyanato anions and are linked into ferromagnetic chains by pairs of µ-1,3-bridging thiocyanato anions. Due to small antiferromagnetic interchain interactions the compound is antiferromagnet with the Néel temperature TN=3.8 K. With increasing magnetic field a metamagnetic transition is observed in field of 260 Oe. Magnetic relaxations in the ground state are well described by the generalized Debye model with one mean relaxation time which is thermally activated according to the Arrhenius equation with the energy barrier ΔE/kB= 37.1 K. The ClBP compound may be classified as so called Single Chain Magnet (SCM) which shows spin dynamics predicted by Glauber [1] for Ising chain systems. An interesting feature is that SCM properties are observed in the antiferromagnetic (ordered) state.
References
[1] R. J. Glauber. Time-Dependent Statistics of the Ising Model. J. Math. Phys., 4(2):294, Feb. 1963.
Primary author
Prof.
Zbigniew Tomkowicz
(Institute of Physics, Jagiellonian University, Kraków)
Co-authors
Prof.
Christian Näther
(Institut of Inorganic Chemistry, University of Kiel, Germany)
Dr
Michał Rams
(Institute of Physics, Jagiellonian University, Kraków)
