Zhang Jun, Duan Lei, Wang Zhe, Wang Xiancheng, Zhao Jianfa, Jin Meiling, Li Wenmin, Zhang Changling, Cao Lipeng, Deng Zheng, Hu Zhiwei, Agrestini Stefano, Valvidares Manuel, Lin Hong-Ji, Chen Chien-Te, Zhu Jinlong, Jin Changqing
Center for High Pressure Science & Technology Advanced Research, Beijing 100094, People's Republic of China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Inorg Chem. 2020 Apr 20;59(8):5377-5385. doi: 10.1021/acs.inorgchem.9b03592. Epub 2020 Apr 3.
The report on the superconductivity of the two-legged spin ladders BaFeS and BaFeSe has established 123-type iron chalcogenides as a novel subgroup in the iron-based superconductor family and has stimulated the continuous exploration of other iron-based materials with new structures and potentially novel properties. In this paper, we report the systematic study of a new quasi-one-dimensional (1D) iron-based compound, BaFeTe, including its synthesis and magnetic properties. The high-pressure synthesized BaFeTe crystallized in a hexagonal structure that mainly consisted of face-sharing FeTe octahedral chains running along the axis, with a lattice constant of = 10.23668 Å; this led to weak interchain coupling and an enhanced one-dimensionality. The systematic static and dynamic magnetic properties were comprehensively studied experimentally. The dc magnetic susceptibility showed typical 1D antiferromagnetic characteristics, with a at 190 K followed by a spin glass (SG) state with freezing at ≈ 6.0 K, which were also unambiguously proved by ac susceptibility measurements. Additionally, X-ray magnetic circular dichroism (XMCD) experiments revealed an unexpected orbital moment for Fe, i.e., 0.84 μ per Fe in BaFeTe. The transport property is electrically insulating, with a thermal activation gap of 0.32 eV. These features mark BaFeTe as an alternative type of iron-based compound, providing a diverse candidate for high-pressure studies in order to pursue some emerging physics.
关于两腿自旋梯子状化合物BaFeS和BaFeSe超导性的报告，已将123型铁硫族化合物确立为铁基超导体家族中的一个新亚组，并激发了对其他具有新结构和潜在新特性的铁基材料的持续探索。在本文中，我们报告了一种新型准一维（1D）铁基化合物BaFeTe的系统研究，包括其合成和磁性。高压合成的BaFeTe结晶为六方结构，主要由沿c轴延伸的共面FeTe八面体链组成，晶格常数c = 10.23668 Å；这导致链间耦合较弱且一维性增强。通过实验全面研究了系统的静态和动态磁性。直流磁化率显示出典型的1D反铁磁特性，在190 K时出现θ，随后在Tf≈6.0 K时进入自旋玻璃（SG）态，这也通过交流磁化率测量得到明确证实。此外，X射线磁圆二色性（XMCD）实验揭示了Fe的意外轨道矩，即在BaFeTe中每个Fe为0.84 μ。其输运性质为电绝缘，热激活能隙为0.32 eV。这些特性标志着BaFeTe是一种另类的铁基化合物，为高压研究提供了多样的候选材料，以探索一些新兴物理现象。
