- By:
- Yang, Fazhi ; Zhang, Heda ; Fabbris, Gilberto; Said, Ayman; Mercado lozano, Pedro; Rajapitamahuni, Anil; Vescovo, Elio; Nelson, Christie; meng, Fanyu; Lei, Hechang; Park, Yunkyu ; Clements, Eleanor M; Ward, Thomas Z; Lee, Honyung ; Liu, Chaoxing; Miao, Hu ; Lin, Shizeng
- Journal Name:
- Nature Communications
- Page Number:
- 1-9
- Volume:
- 16
- Publication Date:
- July 18, 2025
- View DOI Listing:
- https://doi.org/10.1038/s41467-025-61882-z
Abstract
The finite momentum superconducting paring states (FMPs) represent a forefront of condensed matter physics. Here we report experimental evidence of FMP in a locally noncentrosymmetric bulk superconductor 4Hb-TaS2. Using hard X-ray diffraction and angle-resolved photoemission spectroscopy, we reveal unusual 2D ferro-rotational charge density wave (CDW) and weak interlayer hopping in 4Hb-TaS2. The superconducting upper critical field, Hc2, linearly increases via decreasing temperature, and well exceeds the Pauli limit, suggesting the dominant orbital pair-breaking mechanism. Remarkably, we observed evidence of field-induced superconductivity-to-superconductivity transition that breaks continuous rotational symmetry of the s-wave uniform pairing in the Bardeen-Cooper-Schrieffer theory down to the six-fold rotation symmetry. Ginzburg-Landau free energy analysis shows that magnetoelectric coupling, induced by 2D ferro-rotational CDW, stabilizes FMP that provides an explanation of the lowering rotation symmetry. Our results provide a new understanding of unconventional superconducting behaviors of the bulk quantum heterostructure 4Hb-TaS2.
