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Pressure-Tunable Crystal Structure and Magnetic Transition Temperature of the Nowotny Chimney-Ladder CrGeγ Phase
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.inorgchem.1c01887 Takuya Sasaki 1 , Koki Noda 1 , Nico Alexander Gaida 1 , Ken Niwa 1 , Masashi Hasegawa 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.inorgchem.1c01887 Takuya Sasaki 1 , Koki Noda 1 , Nico Alexander Gaida 1 , Ken Niwa 1 , Masashi Hasegawa 1
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A Nowotny chimney-ladder (NCL) chromium germanide (CrGeγ) with varying compositions has been synthesized under high pressure. Crystal structure parameters of the NCL CrGeγ have been calculated by Le Bail refinement based on the superspace group. The refined γ of CrGeγ increases with the synthesis pressure, indicating an increasing Ge content. The NCL CrGeγ phases are ferromagnetic at T = 2 K regardless of their composition, and the magnetic transition temperature (TC) increases when the γ becomes higher. It is noteworthy that CrGe1.763 and CrGe1.774 synthesized at P = 10 and 14 GPa have magnetic transition temperatures of T = 295 and 333 K above room temperature, respectively. Surprisingly, the magnetic transition temperature has changed by ΔTC = 270 K, although the γ values of the raw material and the sample synthesized at P = 14 GPa differ by only Δγ = 0.05, corresponding to an atomic concentration of 0.62 atom %. The synthesis pressure acts as an essential parameter in tuning the composition of the NCL phase. Accordingly, the high-pressure synthesis may significantly control several physical characteristics of NCL phases by utilizing compositional and structural modulation.
中文翻译：
Nowotny Chimney-Ladder CrGeγ相的压力可调晶体结构和磁化转变温度
在高压下合成了具有不同成分的 Nowotny 烟囱梯 (NCL) 锗化铬 (CrGe γ )。NCL CrGe γ 的晶体结构参数已通过基于超空间群的 Le Bail 细化计算。CrGe γ的细化 γ随着合成压力的增加而增加，表明 Ge 含量增加。NCL CrGe γ相在T = 2 K 时是铁磁性的，而不管它们的成分如何，当 γ 变高时，磁转变温度 ( T C ) 也会增加。值得注意的是，CrGe 1.763和CrGe 1.774在合成P= 10 和 14 GPa 的磁转变温度分别为高于室温的T = 295 和 333 K。令人惊讶的是，尽管在P = 14 GPa 下合成的原材料和样品的 γ 值仅相差 Δγ = 0.05，对应于 0.62 原子% 的原子浓度，但磁转变温度已改变了 Δ T C = 270 K。合成压力是调节 NCL 相组成的重要参数。因此，高压合成可以通过利用成分和结构调制来显着控制 NCL 相的几个物理特性。
更新日期：2021-10-04
中文翻译：
Nowotny Chimney-Ladder CrGeγ相的压力可调晶体结构和磁化转变温度
在高压下合成了具有不同成分的 Nowotny 烟囱梯 (NCL) 锗化铬 (CrGe γ )。NCL CrGe γ 的晶体结构参数已通过基于超空间群的 Le Bail 细化计算。CrGe γ的细化 γ随着合成压力的增加而增加，表明 Ge 含量增加。NCL CrGe γ相在T = 2 K 时是铁磁性的，而不管它们的成分如何，当 γ 变高时，磁转变温度 ( T C ) 也会增加。值得注意的是，CrGe 1.763和CrGe 1.774在合成P= 10 和 14 GPa 的磁转变温度分别为高于室温的T = 295 和 333 K。令人惊讶的是，尽管在P = 14 GPa 下合成的原材料和样品的 γ 值仅相差 Δγ = 0.05，对应于 0.62 原子% 的原子浓度，但磁转变温度已改变了 Δ T C = 270 K。合成压力是调节 NCL 相组成的重要参数。因此，高压合成可以通过利用成分和结构调制来显着控制 NCL 相的几个物理特性。
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