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Emergent anisotropy in the Fulde–Ferrell–Larkin–Ovchinnikov state

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  • Shusaku Imajo

    (University of Tokyo)

  • Toshihiro Nomura

    (University of Tokyo)

  • Yoshimitsu Kohama

    (University of Tokyo)

  • Koichi Kindo

    (University of Tokyo)

Abstract

Exotic superconductivity is formed by unconventional electron pairing and exhibits various unique properties that cannot be explained by the basic theory. The Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state is known as an exotic superconducting state in that the electron pairs have a finite center-of-mass momentum leading to a spatially modulated pattern of superconductivity. The spatial modulation endows the FFLO state with emergent anisotropy. However, the anisotropy has never been experimentally verified despite numerous efforts over the years. Here, we report detection of anisotropic acoustic responses depending on the sound propagation direction appearing above the Pauli limit. This anisotropy reveals that the two-dimensional FFLO state has a center-of-mass momentum parallel to the nesting vector on the Fermi surface. The present findings will facilitate our understanding of not only superconductivity in solids but also exotic pairings of various particles.

Suggested Citation

  • Shusaku Imajo & Toshihiro Nomura & Yoshimitsu Kohama & Koichi Kindo, 2022. "Emergent anisotropy in the Fulde–Ferrell–Larkin–Ovchinnikov state," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33354-1
    DOI: 10.1038/s41467-022-33354-1
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    1. Moon-Sun Nam & Arzhang Ardavan & Stephen J. Blundell & John A. Schlueter, 2007. "Fluctuating superconductivity in organic molecular metals close to the Mott transition," Nature, Nature, vol. 449(7162), pages 584-587, October.
    2. H. A. Radovan & N. A. Fortune & T. P. Murphy & S. T. Hannahs & E. C. Palm & S. W. Tozer & D. Hall, 2003. "Magnetic enhancement of superconductivity from electron spin domains," Nature, Nature, vol. 425(6953), pages 51-55, September.
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