论文标题
分子场理论适合抗铁磁gdcu2SI2，CuO，Licro2和alpha-cacr2O4在其Neel温度以下的磁敏感性
Molecular-field-theory fits to magnetic susceptibilities of antiferromagnetic GdCu2Si2, CuO, LiCrO2, and alpha-CaCr2O4 single crystals below their Neel temperatures
论文作者
论文摘要
最近开发的分子场理论（MFT）已用于拟合单一磁敏感性的CHI与温度t数据，以下是各种抗铁磁序列温度TN，用于各种胶原和共晶型非共素质Heisenberg aneisenberg antiferromagnets。假定系统中的旋转通过海森堡交换相互作用，并且在晶体学上相同。共线性抗铁磁体的CHI（T）的拟合参数是可测量的数量：curie-Weiss Law，TN，CHI（TN）中的Weiss温度THETA_P和Coclanar非电压螺旋的旋转S.此处，MFT适合于文献中的各向异性CHI（T）数据，用于截面抗铁磁铁的单晶GDCU2SI2和CUO，以及具有120度环形结构和Alpha-Capr2O4的非共聚抗FiroMagnets LiCR2AS2 LiCR2AS2，并在下面呈现了120度螺旋式螺旋式的heel， CUO的各向异性CHI（T <TN）数据的MFT拟合很差，而GDCU2SI2，LICRO2和Alpha-Cacr2O4的数据拟合非常好。 CUO的差拟合归因于与小Cu自旋相关的强量子波动的影响，而MFT未考虑的准中磁磁性。 MFT还拟合了T <tn时抗铁磁铁GDNIGE3的零场热容量的磁性贡献。
A recently-developed molecular field theory (MFT) has been used to fit single-crystal magnetic susceptibility chi versus temperature T data below the respective antiferromagnetic ordering temperatures TN for a variety of collinear and coplanar noncollinear Heisenberg antiferromagnets. The spins in the system are assumed to interact by Heisenberg exchange and to be identical and crystallographically equivalent. The fitting parameters for chi(T) of collinear antiferromagnets are measurable quantities: the Weiss temperature theta_p in the Curie-Weiss law, TN, chi(TN), and the spin S. For coplanar noncollinear helix and cycloid structures, an additional fitting parameter is the turn angle between layers of ferromagnetically-aligned spins. Here MFT fits to anisotropic chi(T) data from the literature for single crystals of the collinear antiferromagnets GdCu2Si2 and CuO and the noncollinear antiferromagnets LiCr2As2 with a 120 degree cycloidal structure and alpha-CaCr2O4 with a 120 degree helical structure below their respective Neel temperatures are presented. The MFT fit to the anisotropic chi(T < TN) data for CuO is poor, whereas the fits to the data for GdCu2Si2, LiCrO2, and alpha-CaCr2O4 are quite good. The poor fit for CuO is attributed to the influence of strong quantum fluctuations associated with the small Cu spin and the quasi-one-dimensional magnetism that are not taken into account by the MFT. The magnetic contribution to the zero-field heat capacity of the collinear antiferromagnet GdNiGe3 at T < TN is also fitted by the MFT.
