S=1/2 ferromagnetic Heisenberg chain in a verdazyl-based complex
S=1/2 ferromagnetic Heisenberg chain in a verdazyl-based complex
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Verdazyl 复合物中的 S=1/2 铁磁海森堡链
DOI：
10.1103/physrevb.99.094418
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发表时间：
2019
影响因子：
3.7
通讯作者：
Yamaguchi H.
中科院分区：
文献类型：
--
作者：
Uemoto N.;Kono Y.;Kittaka S.;Sakakibara T.;Yajima T.;Iwasaki Y.;Miyamoto S.;Hosokoshi Y.;Yamaguchi H.
本文提出了一个铁磁海森堡链的模型化合物[Zn（hfac）2][4-Cl-o-Py-V-（4-F）2].分子轨道计算表明，铁磁相互作用占主导地位，形成一个铁磁链.磁化率和比热表明相变的反铁磁（AF）由于有限的链间耦合秩序。我们用铁磁海森堡链解释了相变温度以上的磁化率和磁化曲线。有序相的磁化曲线由传统的AF二子晶格模型描述。此外，所得到的磁比热再现了铁磁海森堡链的几乎与温度无关的行为。在低温区，由于铁磁链中的能量色散，磁比热表现出依赖性。
We present a model compound for theferromagnetic Heisenberg chain composed of the verdazyl-based complex [Zn(hfac)2][4-Cl-o-Py-V-(4-F)2].MO calculations indicate a predominant ferromagnetic interaction forming anferromagnetic chain. The magnetic susceptibility and specific heat indicate a phase transition to an antiferromagnetic (AF) order due to the finite interchain couplings. We explain the magnetic susceptibility and magnetization curve above the phase-transition temperature based on theferromagnetic Heisenberg chain. The magnetization curve in the ordered phase is described by a conventional AF two-sublattice model. Furthermore, the obtained magnetic specific heat reproduces the almost temperature-independent behavior of theferromagnetic Heisenberg chain. In the low-temperature region, the magnetic specific heat exhibits adependence, which is attributed to the energy dispersion in the ferromagnetic chain.