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<p>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 4<i>H</i><sub><i>b</i></sub>-TaS<sub>2</sub>. 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 4<i>H</i><sub><i>b</i></sub>-TaS<sub>2</sub>. The superconducting upper critical field, <i>H</i><sub>c2</sub>, 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 4<i>H</i><sub><i>b</i></sub>-TaS<sub>2</sub>.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月18日

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  • 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,
  • H. Miao

摘要

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.