The magnetic properties of an odd spin number antiferromagnetic ring Cr8 Ni have been investigated by high-field magnetization, specific-heat, and nuclear-magnetic-resonance measurements at very low temperatures (below 1 K). It is found that the ground state of this frustrated spin ring is a singlet state with total spin value ST =0 and zero expectation value of the local spins. The energy-level structure for low-lying excited total spin state ST ≠ 0 shows a breakdown of the Landé interval rule in agreement with theoretical results. Evidences of sizeable Dzyaloshinski-Moriya interactions have been found in the magnetic-field dependence of low-temperature specific-heat and magnetization data.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2009 4 1|
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