High-field magnetization of S = 1 antiferromagnetic bond-alternating chain compounds
High-field magnetization of S = 1 antiferromagnetic bond-alternating chain compounds
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DOI：
10.1103/physrevb.69.174405
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发表时间：
2004-05
影响因子：
3.7
通讯作者：
Y. Narumi;K. Kindo;M. Hagiwara;H. Nakano;A. Kawaguchi;K. Okunishi;M. Kohno
中科院分区：
文献类型：
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作者：
Y. Narumi;K. Kindo;M. Hagiwara;H. Nakano;A. Kawaguchi;K. Okunishi;M. Kohno
对S= 1反铁磁交替键链状化合物[Ni 2（dpt）2（μ− ox）（μ− N 3）]（PF 6）[dpt= bis（3-aminopropyl）amine，ox= C 2 O 4]（简称NDOAP）和[Ni（3 3 3− t e t）（μ− NO 2）] ClO 4 [3 3 3− t e t= N，N′-bis（3-aminopropyl）-1，3 propanediamine]（简称NTENP）进行了高场磁化强度和磁化率测量。NDOAP的磁化强度在200和500 kOe处有两个陡峭的增加。在约300和500 kOe之间观察到磁化平台，对应于饱和力矩值的一半。数值计算结果与实验结果的比较表明，NDOAP分子由于二聚作用而具有单重基态，其键交替比α= 0.1。NTENP的磁化强度在700 kOe附近出现半饱和平台。在α= 0.45的单重态-二聚体相的参数下计算的数值结果很好地再现了NTENP的磁化过程。磁化过程的α依赖性进行了讨论。
High-field magnetization and susceptibility measurements have been performed on S= 1 antiferromagnetic bond-alternating chain compounds:[Ni 2 (dpt) 2 (μ− ox)(μ− N 3)](PF 6)[dpt= bis (3-aminopropyl) amine, ox= C 2 O 4](abbreviated as NDOAP) and [Ni (3 3 3− t e t)(μ− NO 2)] ClO 4 [3 3 3− t e t= N, N′-bis (3-aminopropyl)-1, 3propanediamine](abbreviated as NTENP). The magnetization of NDOAP shows two steep increases at about 200 and 500 kOe. A magnetization plateau is observed between about 300 and 500 kOe, corresponding to half the value of the saturation moment. Comparison between numerical calculations and the experimental results, including the magnetic susceptibility, shows that NDOAP has a singlet ground state due to dimerization with a bond-alternating ratio α= 0.1. The half-saturation plateau is also observed around 700 kOe in the magnetization of NTENP. The magnetization process of NTENP is well reproduced by the numerical result calculated for the parameter of α= 0.45 in the singlet-dimer phase. The α dependence of the magnetization processes is discussed.