铁磁半扭转梯形化合物Ba3Cu3In4O12和Ba3Cu3Sc4O12的自旋翻转和反铁磁相
Spin-flop and antiferromagnetic phases of the ferromagnetic half-twist ladder compounds Ba3Cu3In4O12 and Ba3Cu3Sc4O12
摘要：
标题化合物在s =1/2 Cu 2 ^{+}离子的一维半扭转梯内具有主要的铁磁（FM）交换作用，梯间具有反铁磁（AFM）作用，导致在低于20 K的温度下形成有序的3D相。在这里，我们表明，结合亚晶格磁化的唯象模型的顺磁（PM）相的微观一维模型描述所观察到的温度和磁场相关的磁性。该模型识别AFM，自旋翻转（SF）和PM相，其边界在实验磁化强度M（T，H）和比热CP（T，H）中具有尖锐的特征。精确的对角化（ED）的1D模型，可能为24自旋由于特殊的结构特征的半扭转梯子，产生的PM阶段的磁化和自旋磁化率。AFM梯子之间的相互作用包括在平均场水平使用的字段，HAF，从建模的有序相。各向同性交换J1 = -135K和g张量g = 2.1内的阶梯，加上交换和各向异性场HAF和HA，描述了有序相，并几乎是定量的PM相。
英文摘要：
The title compounds have dominant ferromagnetic (FM) exchange interactions within one-dimensional (1D) half-twist ladders of s =1/2 Cu2^{+} ions and antiferromagnetic(AFM) interactions between ladders, leading to ordered 3D phases at temperatures below 20K. Here we show that a microscopic 1D model of the paramagnetic (PM) phase combined with a phenomenological model based on sublattice magnetization describes the observed temperature and field dependent magnetism. The model identifies AFM, spin-flop (SF) and PM phases whose boundaries have sharp features in the experimental magnetization M(T,H) and specific heat CP(T,H). Exact diagonalization (ED) of the 1D model, possible for 24 spins due to special structural features of half-twist ladders, yields the magnetization and spin susceptibility of the PM phase. AFM interactions between ladders are included at the mean-field level using the field, HAF, obtained from modeling the ordered phases. Isotropic exchange J1 = -135K and g-tensor g = 2.1 within ladders, plus exchange and anisotropy fields HAF and HA, describe the ordered phases, and are almost quantitative for the PM phase.
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