Structural phase transition driven by spin-lattice interaction in a quasi-one-dimensional spin system of [1-(4'-iodobenzyl)pyridinium][Ni(mnt)2].
Structural phase transition driven by spin-lattice interaction in a quasi-one-dimensional spin system of [1-(4'-iodobenzyl)pyridinium][Ni(mnt)2].
复制标题
DOI：
10.1021/jp051995g
复制
发表时间：
2005-09
期刊：
影响因子：
--
通讯作者：
X. Ren;T. Akutagawa;S. Nishihara;Takayoshi Nakamura;W. Fujita;K. Awaga
中科院分区：
文献类型：
--
作者：
X. Ren;T. Akutagawa;S. Nishihara;Takayoshi Nakamura;W. Fujita;K. Awaga
测定了两个新化合物[1-（4 '-碘苄基）吡啶][M（mnt）2]（mnt 2- =马来腈二硫纶; M = Ni（1）或Cu（2））的晶体结构和磁性。在室温下，1和2的单晶是同构的，其特征在于形成具有规则的阳离子和阴离子堆叠的偏析柱状结构。对于晶体1，在约120 K下观察到磁转变;此外，其磁行为与高温相（HT相）中S = 1/2的常规海森堡反铁磁（AFM）链和低温相（LT相）中的自旋带隙系统的磁行为一致。这种现象类似于自旋-佩尔斯跃迁。然而，在LT相在100 K的晶体结构1揭示了其结构转变与磁转变。因为晶体2（S = 0）没有表现出结构转变，所以1的结构转变由自旋-晶格相互作用驱动。
Crystal structures and magnetic properties were determined for two novel compounds, [1-(4'-iodobenzyl)pyridinium][M(mnt)2] (mnt2- = maleonitriledithiolate; M = Ni (1) or Cu (2)). At room temperature, single crystals of 1 and 2 were isostructural, featuring the formation of segregated columnar structures with regular stacks of cations and anions. For crystal 1, a magnetic transition was observed at approximately 120 K; furthermore, its magnetic behavior was consistent with that of a regular Heisenberg antiferromagnetic (AFM) chain of S = 1/2 in the high-temperature phase (HT phase) and that of a spin-gap system in the low-temperature phase (LT phase). Such a phenomenon is similar to the spin-Peierls transition. However, the crystal structure of 1 in the LT phase at 100 K revealed that its structural transition is associated with the magnetic transition. Because crystal 2 (S = 0) did not exhibit a structural transition, the structural transition of 1 is driven by spin-lattice interaction.