The Synthesis of a Quasi-One-Dimensional Iron-Based Telluride with Antiferromagnetic Chains and a Spin Glass State

作者：Jun Zhang, Lei Duan, Zhe Wang, Xiancheng Wang, Jianfa Zhao, Meiling Jin, Wenmin Li, Changling Zhang, Lipeng Cao, Zheng Deng, Zhiwei Hu, Stefano Agrestini, Manuel Valvidares, Hong‐Ji Lin, Chien‐Te Chen, Jinlong Zhu, Changqing Jin · 发表于：Inorganic Chemistry · 年份：2020 · DOI：10.1021/acs.inorgchem.9b03592 · 被引用次数：27 · 研究领域：Iron-based superconductors research、Rare-earth and actinide compounds、Physics of Superconductivity and Magnetism

The report on the superconductivity of the two-legged spin ladders BaFe 2 S 3 and BaFe 2 Se 3 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, Ba 9 Fe 3 Te 15, including its synthesis and magnetic properties. The high-pressure synthesized Ba 9 Fe 3 Te 15 crystallized in a hexagonal structure that mainly consisted of face-sharing FeTe 6 octahedral chains running along the c axis, with a lattice constant of a = 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 T max at 190 K followed by a spin glass (SG) state with freezing at T f ≈ 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 2+, i.e., 0.84 μ B per Fe in Ba 9 Fe 3 Te 15 . The transport property is electrically insulating, with a thermal activation gap of 0.32 eV. These features mark Ba 9 Fe 3 Te 15 as an alternative type of iron-based compound, providing a diverse candidate for hi...