Signature of magnetoelectric coupling driven finite momentum pairing in 3D ising superconductor

F. Z. Yang, H. D. Zhang, Saswata Mandal, F. Y. Meng, G. Fabbris, A. H. Said, P. Mercado Lozano, A. Rajapitamahuni, E. Vescovo, C. Nelson, S. Lin, Y. Park, E. M. Clements, T. Z. Ward, H.-N. Lee, H. C. Lei (), C. X. Liu () and H. Miao ()
Additional contact information
F. Z. Yang: Oak Ridge National Laboratory
H. D. Zhang: Oak Ridge National Laboratory
Saswata Mandal: The Pennsylvania State University
F. Y. Meng: Renmin University of China
G. Fabbris: Argonne National Laboratory
A. H. Said: Argonne National Laboratory
P. Mercado Lozano: Argonne National Laboratory
A. Rajapitamahuni: Brookhaven National Laboratory
E. Vescovo: Brookhaven National Laboratory
C. Nelson: Brookhaven National Laboratory
S. Lin: Oak Ridge National Laboratory
Y. Park: Oak Ridge National Laboratory
E. M. Clements: Oak Ridge National Laboratory
T. Z. Ward: Oak Ridge National Laboratory
H.-N. Lee: Oak Ridge National Laboratory
H. C. Lei: Renmin University of China
C. X. Liu: The Pennsylvania State University
H. Miao: Oak Ridge National Laboratory

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-61882-z

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