Static and Dynamic Magnetic Response of Fragmented Haldane-like Spin Chains in Layered Li3Cu2SbO6
Static and Dynamic Magnetic Response of Fragmented Haldane-like Spin Chains in Layered Li3Cu2SbO6
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DOI：
10.7566/jpsj.85.084702
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发表时间：
2016-08-15
影响因子：
1.7
通讯作者：
Klingeler, Ruediger
中科院分区：
文献类型：
--
作者：
Koo, Changhyun;Zvereva, Elena A.;Klingeler, Ruediger
层状Li 3Cu 2SbO 6的结构和磁性能进行了研究，通过粉末X射线衍射，静态磁化率，和电子自旋共振研究高达330 GHz。XRD数据实验验证了空间群C2/m，与先前报道的C2/c相比，晶胞体积减半。此外，数据显示出显著的Li/Cu-位间交换。静态磁化率和ESR测量显示了两个磁贡献，即，低温下的准自由自旋和自旋带隙的磁性子系统，其中大约一半的自旋与每个子系统相关联。结果表明，在J（FM）= -285K和J（AFM）= 160 K的条件下，铁磁-反铁磁交替链中含有大量的Li缺陷.结果进行了讨论的情况下，破碎的一维S = 1 AFM链具有相当高的缺陷浓度约为17%和相关的S = 1/2的边缘状态所产生的有限Halfoxin链。
The structure and the magnetic properties of layered Li3Cu2SbO6 are investigated by powder X-ray diffraction, static susceptibility, and electron spin resonance studies up to 330 GHz. The XRD data experimentally verify the space group C2/m with halved unit cell volume in contrast to previously reported C2/c. In addition, the data show significant Li/Cu-intersite exchange. Static magnetic susceptibility and ESR measurements show two magnetic contributions, i.e., quasi-free spins at low-temperature and a spin-gapped magnetic subsystem, with about half of the spins being associated to each subsystem. The data suggest ferromagnetic-antiferromagnetic alternating chains with J(FM) = -285K and J(AFM) = 160K with a significant amount of Li-defects in the chains. The results are discussed in the scenario of fragmented 1D S = 1 AFM chains with a rather high defect concentration of about 17% and associated S = 1/2 edge states of the resulting finite Haldane chains.