[Ni(en)(H2 O)4 ][SO4 ] · 2H2 O - an S = 1 Molecular Magnet with Easy-Plane Anisotropy

R. Tarasenko, A. Orendáčová, K. Tibenská, I. Potočňák, M. Kajňaková, A. Vlček, M. Orendáč and A. Feher Centre of Low Temperature Physics of SAS and P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovak Republic

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Received: 9 07 2007;

Structural analysis of [Ni(en)(H2 O)4 ][SO4 ] · 2H2 O was performed and it suggests that the crystal field should play a dominant role in the magnetic properties of the system. This conjecture coincides well with the specific heat and susceptibility behaviour. The analysis confirmed that the compound can be treated as a spin 1 single molecule magnet with nonmagnetic ground state introduced by easy-plane single-ion anisotropy D/kB ≈11 K and neglecting in-plane anisotropy E/D < 0.1.

DOI: 10.12693/APhysPolA.113.481 PACS numbers: 75.30.Et, 75.30.Gw, 75.40.Cx