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Vortex entropy and superconducting fluctuations in ultrathin underdoped Bi2Sr2CaCu2O8+x superconductor

Author

Listed:
  • Shuxu Hu

    (Tsinghua University)

  • Jiabin Qiao

    (Tsinghua University
    Beijing Institute of Technology
    Beijing Academy of Quantum Information Sciences)

  • Genda Gu

    (Brookhaven National Laboratory)

  • Qi-Kun Xue

    (Tsinghua University
    Beijing Academy of Quantum Information Sciences
    Southern University of Science and Technology
    Frontier Science Center for Quantum Information)

  • Ding Zhang

    (Tsinghua University
    Beijing Academy of Quantum Information Sciences
    Frontier Science Center for Quantum Information
    Wako)

Abstract

Vortices in superconductors can help identify emergent phenomena but certain fundamental aspects of vortices, such as their entropy, remain poorly understood. Here, we study the vortex entropy in underdoped Bi2Sr2CaCu2O8+x by measuring both magneto-resistivity and Nernst effect on ultrathin flakes (≤2 unit-cell). We extract the London penetration depth from the magneto-transport measurements on samples with different doping levels. It reveals that the superfluid phase stiffness ρs scales linearly with the superconducting transition temperature Tc, down to the extremely underdoped case. On the same batch of ultrathin flakes, we measure the Nernst effect via on-chip thermometry. Together, we obtain the vortex entropy and find that it decays exponentially with Tc or ρs. We further analyze the Nernst signal above Tc in the framework of Gaussian superconducting fluctuations. The combination of electrical and thermoelectric measurements in the two-dimensional limit provides fresh insight into high temperature superconductivity.

Suggested Citation

  • Shuxu Hu & Jiabin Qiao & Genda Gu & Qi-Kun Xue & Ding Zhang, 2024. "Vortex entropy and superconducting fluctuations in ultrathin underdoped Bi2Sr2CaCu2O8+x superconductor," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48899-6
    DOI: 10.1038/s41467-024-48899-6
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