Spin Ordering in a Spin-Pair System
Spin Ordering in a Spin-Pair System
复制标题
自旋对系统中的自旋排序
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
Takemi Yamada
中科院分区：
文献类型：
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作者：
M. Tachiki;Takemi Yamada
从理论上研究了自旋对系统中一种新型的自旋排序。在该系统中，对内交换相互作用是反铁磁性的，并且比对间交换相互作用强得多。在外部磁场中，该对中的受激三重态分裂，并且三重态的最低分量在一定强度的磁场下穿过地面单重态。在能级交叉点附近，即使是弱的对间交换相互作用也会导致单线态和三线态最低组分之间的大量混合。由于混合，发生垂直于外场的自旋分量的排序。这种顺序解释了 Haseda 等人发现的异常现象。在他们的 Cu(NO 3 ) 2 2.5H 2 O 绝热磁化冷却实验中。
A new type of spin ordering in a spin-pair system is theoretically investigated. In the system, the intra-pair exchange interaction is antiferromagnetic and is much stronger than the inter-pair exchange interaction. In an external magnetic field, the excited triplet of the pair splits, and the lowest component of the triplet crosses the ground singlet at a certain magnitude of the field. In the vicinity of the point of level crossing, even the weak inter-pair exchange interaction causes a considerable amount of mixing between the singlet and the lowest component of the triplet. Due to the mixing, an ordering of the spin component perpendicular to the external field occurs. This ordering explains an anomaly which has been found by Haseda et al. in their experiment of cooling by adiabatic magnetization of Cu(NO 3 ) 2 2.5H 2 O.