Coexistence of Superconductivity and Antiferromagnetism in Topological Magnet MnBi 2 Te 4 Films

作者：Wei Yuan, Zi‐Jie Yan, Hemian Yi, Z. Wang, Stephen Paolini, Yifan Zhao, Ling‐Jie Zhou, Annie G. Wang, Ke Wang, Thomas Prokscha, Z. Salman, Andreas Suter, Purnima P. Balakrishnan, Alexander J. Grutter, Laurel E. Winter, John Singleton, Moses H. W. Chan, Cui‐Zu Chang · 发表于：Nano Letters · 年份：2024 · DOI：10.1021/acs.nanolett.4c01407 · 被引用次数：18 · 研究领域：Topological Materials and Phenomena、Advanced Condensed Matter Physics、Electronic and Structural Properties of Oxides

The interface of two materials can harbor unexpected emergent phenomena. One example is interface-induced superconductivity. In this work, we employ molecular beam epitaxy to grow a series of heterostructures formed by stacking together two nonsuperconducting antiferromagnetic materials, an intrinsic antiferromagnetic topological insulator MnBi 2 Te 4 and an antiferromagnetic iron chalcogenide FeTe. Our electrical transport measurements reveal interface-induced superconductivity in these heterostructures. By performing scanning tunneling microscopy and spectroscopy measurements, we observe a proximity-induced superconducting gap on the top surface of the MnBi 2 Te 4 layer, confirming the coexistence of superconductivity and antiferromagnetism in the MnBi 2 Te 4 layer. Our findings will advance the fundamental inquiries into the topological superconducting phase in hybrid devices and provide a promising platform for the exploration of chiral Majorana physics in MnBi 2 Te 4 -based heterostructures.