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Related Experiment Videos

Interacting random Dirac fermions in superconducting cuprates.

D V Khveshchenko1, A G Yashenkin, I V Gornyi

  • 1Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.

Physical Review Letters
|June 1, 2001
PubMed
Summary

We investigated how quasiparticle interactions affect disorder-induced localization in high-temperature cuprate superconductors. Our findings reveal interaction corrections impacting key properties and assess localization theories for Dirac fermions in these materials.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • High-temperature cuprate superconductors exhibit complex electronic behavior, including disorder-induced localization.
  • Understanding quasiparticle interactions is crucial for explaining phenomena like those observed in Bi2Sr2CaCu2O(8+delta).
  • The presence of an incipient second pairing transition (d --> d + is(id')) suggests novel interaction mechanisms.

Purpose of the Study:

  • To investigate the influence of quasiparticle interactions on the localization of Dirac-like nodal excitations in cuprates.
  • To analyze how order parameter fluctuations mediate these interactions near a specific pairing transition.
  • To evaluate the applicability of existing localization theories for noninteracting Dirac fermions to this complex system.

Main Methods:

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  • Theoretical analysis of quasiparticle interactions.
  • Focus on interactions mediated by order parameter fluctuations near a d --> d + is(id') transition.
  • Calculation of interaction corrections to various physical properties.

Main Results:

  • Identified significant interaction corrections to the density of states, specific heat, and conductivity.
  • Quantified the effects of interactions on phase and energy relaxation rates.
  • Assessed the relevance of localization scenarios for noninteracting random Dirac fermions in cuprates.

Conclusions:

  • Quasiparticle interactions play a critical role in disorder-induced localization phenomena in high-Tc cuprates.
  • The findings provide insights into the electronic behavior of these materials, particularly near incipient pairing transitions.
  • The study highlights limitations of applying noninteracting theories to complex superconducting systems.