Takahashi Hiroki, Kikuchi Ryosuke, Kawashima Chizuru, Imaizumi Satoshi, Aoyama Takuya, Ohgushi Kenya
College of Humanities & Sciences, Nihon University, Tokyo 156-8550, Japan.
Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Materials (Basel). 2022 Feb 14;15(4):1401. doi: 10.3390/ma15041401.
The iron-based superconductors had a significant impact on condensed matter physics. They have a common structural motif of a two-dimensional square iron lattice and exhibit fruitful physical properties as a strongly correlated electron system. During the extensive investigations, quasi-one-dimensional iron-based spin-ladder compounds attracted much attention as a platform for studying the interplay between magnetic and orbital ordering. In these compounds, BaFeS and BaFeSe were found to exhibit superconductivity under high pressure, having a different crystal and magnetic structure at low temperature. We report a brief review of the iron-based spin-ladder compound and recent studies for BaFe(SSe). BaFe(S Se) is in the vicinity of the boundary of two different magnetic phases and it is intriguing to perform high pressure experiments for studying superconductivity, since effects of large magnetic fluctuations on superconductivity are expected. The effect of iron stoichiometry on the interplay between magnetism and superconductivity is also studied by changing the iron concentration in BaFeSe.
铁基超导体对凝聚态物理产生了重大影响。它们具有二维方形铁晶格的共同结构 motif，并作为强关联电子系统展现出丰富的物理性质。在广泛的研究过程中，准一维铁基自旋梯子化合物作为研究磁序和轨道序之间相互作用的平台备受关注。在这些化合物中，发现 BaFeS 和 BaFeSe 在高压下表现出超导性，在低温下具有不同的晶体和磁结构。我们报告了对铁基自旋梯子化合物以及 BaFe(SSe) 的近期研究的简要综述。BaFe(S Se) 处于两种不同磁相的边界附近，进行高压实验来研究超导性很有趣，因为预计大的磁涨落会对超导性产生影响。还通过改变 BaFeSe 中的铁浓度来研究铁化学计量对磁性和超导性之间相互作用的影响。
