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Evidence of field induced slow magnetic relaxation in cis-Co(hfac)2(H2O)2 exhibiting tri-axial anisotropy with negative axial component

Abstract

We report the combined experimental characterization and theoretical modeling of the hexa-coordinated high-spin Co(II) complex cis-[Co(hfac)2(H2O)2] (I). The magnetic static field (DC) data and EPR spectra (measurements were carried out on the powder samples of diluted samples cis-[Co0.02Zn0.98 (hfac)2(H2O)2]) were analyzed with the aid of the parametric Griffith Hamiltonian for the high-spin Co(II) supported by the ab initio calculations of the crystal field (CF) parameters, g-factors and superexchange parameters between H-bonded Co(II) ions in the neighboring molecules in 1D network. This analysis suggests the presence of the easy axis of magnetic anisotropy and also shows the existence of a significant rhombic component. Detected frequency dependent (AC) susceptibility signal shows that complex I exhibits slow paramagnetic relaxation in applied DC field belonging thus to the class of non-uniaxial field induced single ion magnets with negative axial component of anisotropy. It is demonstrated that the main contributions to the relaxation come from the direct one-phonon process dominating at low temperatures, while the contribution of the two-phonon Raman process becomes important with increasing temperature.

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Publication details

The article was received on 06 Apr 2017, accepted on 09 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7DT01236E
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Evidence of field induced slow magnetic relaxation in cis-Co(hfac)2(H2O)2 exhibiting tri-axial anisotropy with negative axial component

    D. V. Korchagin, A. Palii, E. A. Yureva, A. V. Akimov, E. Y. Misochko, G. V. Shilov, A. D. Talantsev, R. B. Morgunov, A. A. Shakin, S. M. Aldoshin and B. Tsukerblat, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT01236E

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