2026-04-28 合肥物質科学研究院（HFIPS）
Ultrasensitive detection of the Meissner effect in two-dimensional superconductors (Image by WANG Kang)
＜関連情報＞
- https://english.hf.cas.cn/nr/bth/202604/t20260428_1158195.html
- https://advanced.onlinelibrary.wiley.com/doi/10.1002/adma.73127
微小スケール二次元ファンデルワールス超伝導体におけるマイスナー効果の解明 Probing the Meissner Effect in Microscale Two-Dimensional van der Waals Superconductors
Kang Wang, Meng Shi, Qikang Gan, Feixiang Diao, Ning Wang, Xueqin Li, Ran Wang, Teng Xu, Yizhou Liu, Lin Hao, Ning Hao, Tianyu Xue, Lei Wang, Haifeng Du
Advanced Materials Published: 16 April 2026
DOI:https://doi.org/10.1002/adma.73127
ABSTRACT
(2D) van der Waals (vdW) superconductors provide a platform for investigating unconventional superconductivity, topological states, and low-power quantum devices. However, due to their extremely small volume and weak magnetic signals, their superconductivity has primarily been assessed through zero resistance, while the Meissner effect remains largely unexplored. Here, we demonstrate that dynamic cantilever magnetometry (DCM) can be used to probe the intrinsic Meissner diamagnetism in 2D vdW superconductors. A theoretical model is first established to quantitatively extract magnetization and susceptibility. Building on this, using 2M-WS2 as a model system, a clear magnetization hysteresis loop characteristic of type-II superconductivity is resolved. Meanwhile, susceptibility is also detected down to a thickness of 5.7 nm, revealing a screening efficiency of about 89.9% at 4.6 mT, indicative of nearly complete diamagnetic screening. We analyze that DCM achieves a magnetization sensitivity of ～1.1×10-17 A・m2 and susceptibility sensitivity of ～9.4×10-17 A・m2 /T. Our results provide crucial magnetic signatures of the Meissner effect in 2D vdW superconductors and highlight the capability of DCM for magnetic validation of superconductivity in low-dimensional materials.
