Evidence of spin singlet ground state in the frustrated antiferromagnetic ring Cr8Ni
Evidence of spin singlet ground state in the frustrated antiferromagnetic ring Cr8Ni
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DOI：
10.1103/physrevb.79.134416
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发表时间：
2009-04-01
影响因子：
3.7
通讯作者：
Winpenny, Richard E. P.
中科院分区：
文献类型：
--
作者：
Furukawa, Yuji;Kiuchi, Kazuki;Winpenny, Richard E. P.
在极低温度（低于1 K）下，通过高场磁化强度、比热容和核磁共振测量研究了奇自旋反铁磁环Cr 8 Ni的磁性.结果表明，该阻挫自旋环的基态为单重态，其总自旋值S-T=0，局域自旋期望值为零。低激发态S-T不等于0的能级结构表明Lande间隔规则被打破，与理论结果一致。在低温比热和磁化强度数据的磁场依赖性中发现了相当大的Dzyaloshinski-Moriya相互作用的证据。
The magnetic properties of an odd spin number antiferromagnetic ring Cr8Ni 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 S-T=0 and zero expectation value of the local spins. The energy-level structure for low-lying excited total spin state S-T not equal 0 shows a breakdown of the Lande 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.