Chiral Ruthenium Halide Semiconductor with Strong Antiferromagnetic Coupling
Haolin Lu, Tengfei He, Haolin Wu, Fenglian Qi, Hebin Wang, Bing Sun, Tianyin Shao, Tianjiao Qiao, Hao‐Li Zhang, Dali Sun, Yongsheng Chen, Zhiyong Tang, Guankui Long
Abstract
Abstract Chiral hybrid organic–inorganic metal halides have attracted wide attention owing to their superior chiroptoelectronic and chirospintronic properties. Here, a new class of chiral lead‐free metal halides, ( R / S ‐MBA) 3 Ru 2 Br 9 (MBA = methylbenzylammonium), with unique magnetic properties is reported. ( R / S ‐MBA) 3 Ru 2 Br 9 is composed of a surface‐shared octahedron dimer separated by chiral cations and crystallizes into the Sohncke space group of P2 1 2 1 2 1 . The crystal structures, chiroptical, magnetic properties, and magnetic circular dichroism of ( R / S ‐MBA) 3 Ru 2 Br 9 are systematically investigated. Owing to the strong antiferromagnetic coupling between the Ru atom through bromine bridge in the [Ru 2 Br 9 ] 3− dimer and the weak ferromagnetic coupling between the neighboring [Ru 2 Br 9 ] 3− dimer, ( R / S ‐MBA) 3 Ru 2 Br 9 exhibits antiferromagnetic property with Néel temperature at 7 K. Considering the unique magnetic property of ruthenium, together with the rapid progress of antiferromagnetic spintronics and optospintronics recently, this work provides a novel multifunctional lead‐free chiral magnetic candidate toward chiral optoelectronics and antiferromagnetic spintronics.