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Superconductivity due to fluctuating loop currents.

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Summary
This summary is machine-generated.

Fluctuating orbital magnetism (loop currents) can drive unconventional superconductivity, but not the d-wave type seen in cuprates. These currents must break translation symmetry to be relevant for cuprates.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Orbital magnetism and loop currents (LCs) are proposed mechanisms in various superconductors like cuprates.
  • LCs are hypothesized to explain phenomena such as the pseudogap and d-wave superconductivity in cuprates.

Purpose of the Study:

  • Investigate if fluctuating intra-unit-cell LCs can induce unconventional superconductivity.
  • Determine the role of LCs in cuprate superconductivity.

Main Methods:

  • Theoretical analysis of fluctuating intra-unit-cell LCs.
  • Examination of pairing channels near a quantum-critical point (QCP).

Main Results:

  • Odd-parity LCs are repulsive in all pairing channels near the QCP.
  • Even-parity LC fluctuations induce unconventional pairing, but are not amplified near the QCP.
  • Fluctuating intra-unit-cell LCs are unlikely to cause d-wave superconductivity in cuprates.

Conclusions:

  • Even-parity LCs can mediate unconventional superconductivity, distinct from other fluctuation types.
  • Intra-unit-cell LCs are unlikely to be the primary driver of d-wave superconductivity in cuprates.
  • For LCs to be relevant in cuprates, they likely need to break translational symmetry.