Field-induced spin-crossover transition of [MnIII(taa)] studied under pulsed magnetic fields
Field-induced spin-crossover transition of [MnIII(taa)] studied under pulsed magnetic fields
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DOI：
10.1103/physrevb.72.064448
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发表时间：
2005-08
影响因子：
3.7
通讯作者：
S. Kimura;Y. Narumi;K. Kindo;M. Nakano;G. Matsubayashi
中科院分区：
文献类型：
--
作者：
S. Kimura;Y. Narumi;K. Kindo;M. Nakano;G. Matsubayashi
我们对自旋交叉络合物$[{\mathm{Mn}}^{III}(\mathm{taa})]$$({\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\text{\ensuremath{-}}(2\text{\ensuremath{-}}\mathrm{azolyl})\text{\ensuremath{-}}2\text{\ensuremath{-}}\mathrm{azabuten}\text{\ensuremath{-进行了高场磁化强度的测量脉冲磁场作用下的}}4\text{\ensuremath{-}}\mathrm{yl})\mathrm{amine})$。成功地观察到了场诱导的自旋-交叉跃迁。在外加磁场的作用下，实现了从低自旋态到高自旋态的完全转换。得到的场温相图与分析一致，考虑了最近介电测量提出的高自旋态[{mathm{Mn}}^{III}(mathm{TAA})]$的动态结构无序的熵贡献.观察到的场致相变伴随着较大的磁滞。为了弄清场诱导自旋交叉的动态特性，在不同扫频的脉冲场下进行了测量。磁滞对扫描速度的强烈依赖性表明，随着扫描速度的增加，弛豫过程发生了交叉。
We have performed the high-field magnetization measurements on the spin-crossover complex $[{\mathrm{Mn}}^{III}(\mathrm{taa})]$ $({\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\text{\ensuremath{-}}(2\text{\ensuremath{-}}\mathrm{azolyl})\text{\ensuremath{-}}2\text{\ensuremath{-}}\mathrm{azabuten}\text{\ensuremath{-}}4\text{\ensuremath{-}}\mathrm{yl})\mathrm{amine})$ under pulsed magnetic fields. The field-induced spin-crossover transition is successfully observed. The full conversion from the low to the high spin state by external magnetic field is achieved. The obtained field-temperature phase diagram agrees with the analysis, taking into account the entropy contribution from the dynamic structural disorder in the high spin state of $[{\mathrm{Mn}}^{III}(\mathrm{taa})]$, which was proposed from the recent dielectric measurement. The observed field-induced transition accompanies with large hysteresis. Measurements under the pulsed fields with different sweep rates are conducted in order to clarify the dynamic character of the field-induced spin-crossover. Strong sweep rate dependence of the hysteresis indicates that crossover of the relaxation process takes place upon increasing the sweep rate.