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

M. Hagiwara, Y. Narumi, A. Matsuo, H. Yashiro, S. Kimura, K. Kindo

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3 Citations (Scopus)


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] (ClO 4)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 J 2/k2 = 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.

Original languageEnglish
Article number176
JournalNew Journal of Physics
Publication statusPublished - 2006 Sep 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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