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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Robust Superconductivity in Quasi-one-dimensional Multiband Materials.

T T Saraiva1, L I Baturina2, A A Shanenko1

  • 1HSE University, 101000, Moscow, Russia.

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|November 23, 2021
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Summary
This summary is machine-generated.

Quasi-one-dimensional (Q1D) fluctuations are suppressed by shallow higher-dimensional bands, explaining robust superconductivity in chain-like materials like A2Cr3As3. This finding advances understanding of complex superconducting states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Multiband superconductors can exhibit robust aggregate pair condensates through pair-exchange coupling.
  • Quasi-one-dimensional (Q1D) thermal pair fluctuations are typically suppressed by deep conventional bands.

Purpose of the Study:

  • To investigate the impact of shallow higher-dimensional bands on Q1D fluctuations in multiband superconductors.
  • To elucidate the mechanism behind robust superconductivity in chain-like materials A2Cr3As3.

Main Methods:

  • Theoretical analysis of pair-exchange coupling between Q1D and higher-dimensional bands.
  • Investigating the role of Fermi level and cutoff energy in suppressing Q1D fluctuations.

Main Results:

  • Q1D fluctuations are significantly weakened even by nearly shallow higher-dimensional bands.
  • The presence of shallow bands is sufficient to stabilize the aggregate pair condensate.

Conclusions:

  • Shallow higher-dimensional bands play a crucial role in the robust superconducting state of materials like A2Cr3As3.
  • This work provides new insights into the design and understanding of novel superconducting materials.