Field-induced long-range order in the S=1 antiferromagnetic chain
Field-induced long-range order in the S=1 antiferromagnetic chain
复制标题
S=1 反铁磁链中的场感应长程有序
DOI：
10.1103/physrevb.62.r9240
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发表时间：
2000
影响因子：
3.7
通讯作者：
T. Sakai
中科院分区：
文献类型：
--
作者：
T. Sakai
利用有限链的精确对角化和链间相互作用的平均场近似，研究了H磁场中拟一维S=1反铁磁体。在单离子各向异性D存在的情况下，给出了H \平行D和H \正D在H \平行D和H \正D平面上的完整相图。在NDMAP的最新实验中发现，在这两种情况下，场致远程有序相的形状有很大的不同。估算的NDMAP链间和链内耦合比（J′/J ~ 10^{-3}）与中子散射测量结果一致。
The quasi-one dimensional S=1 antiferromagnet in magnetic field H is investigated with the exact diagonalization of finite chains and the mean field approximation for the interchain interaction. In the presence of the single-ion anisotropy D, the full phase diagram in the $HT$ plane is presented for H \parallel D and H \perp D. The shape of the field-induced long-range ordered phase is revealed to be quite different between the two cases, as observed in the recent experiment of NDMAP. The estimated ratio of the interchain and intrachain couplings of NDMAP (J'/J ~ 10^{-3}) is consistent with the neutron scattering measurement.