Magnetic properties of a Ni tetramer with a butterfly structure in high magnetic fields

Details Magnetic properties of a Ni tetramer with a butterfly structure in high magnetic fields Magnetic properties of a Ni tetramer with a butterfly structure in high magnetic fields

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006njph....8..176h&link_type=abstract

New Journal of Physics, Volume 8, Issue 9, pp. 176 (2006).

Physics

Scientific paper

We have performed magnetic susceptibility and low and high field magnetization measurements on single crystals of the Ni tetramer compound [Ni4(μ-CO3)2(aetpy)8] (ClO4)4 (aetpy = 2-aminoethyl-pyridine) with a butterfly (diamond) structure. We observed a two-step-like magnetization curve and a further increase of magnetization around 63 T in magnetic fields up to 68 T perpendicular to the Ni tetramer plane (c-axis). From the magnetic fields at steep jumps of the magnetization, we determine broadly the short diagonal (J1) and the side (J2) antiferromagnetic exchange constants between the Ni ions (J1/kB = 41.9 K and J2/kB = 9.2 K) in this compound. The long diagonal exchange interaction (J3) is ferromagnetic and the exchange constant is evaluated as J3/kB = -0.66± 0.04 K from the comparison between the magnetization measured in steady fields at 2 K and the calculated one. The origin of hysteresis of the magnetization in pulsed magnetic fields is discussed based on the calculated energy diagram.

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