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

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 4H_b-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 4H_b-TaS₂. The superconducting upper critical field, H_c2, 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

SUBMITTER: Yang FZ 

PROVIDER: S-EPMC12274449 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature