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Interplay between density and superconducting quantum critical fluctuations.

S Caprara1, N Bergeal, J Lesueur

  • 1Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 5, I-00185 Roma, Italy. Istituto dei Sistemi Complessi CNR and CNISM Unità di Roma Sapienza, 00185 Roma, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 30, 2015
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Summary
This summary is machine-generated.

Quantum critical density fluctuations impact superconductivity dynamics near electronic phase separation. This interplay may explain superconductivity loss in gated LaAlO3/SrTiO3 interfaces.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Investigating metal-superconductor transitions is crucial for understanding emergent quantum phenomena.
  • Electronic phase separation and superconducting fluctuations are key factors in complex material behavior.

Purpose of the Study:

  • To explore the interplay between superconducting and density fluctuations near a quantum critical point.
  • To understand how these fluctuations influence the metal-superconductor transition.
  • To investigate the mechanism behind superconductivity disappearance at the LaAlO3/SrTiO3 interface.

Main Methods:

  • Theoretical analysis of quantum critical phenomena.
  • Examining the dynamics of Cooper-pair fluctuations under critical density fluctuations.
  • Focusing on a system with electronic phase separation vanishing at zero temperature.

Main Results:

  • Identified a quantum critical point where density fluctuations become critical.
  • Demonstrated that critical density fluctuations impart a singular character to Cooper-pair fluctuations.
  • Established a dynamical critical index of z=3 for these fluctuations.

Conclusions:

  • The interplay between critical density and superconducting fluctuations provides a potential mechanism for superconductivity suppression.
  • This scenario is relevant to density-driven transitions, particularly at interfaces like LaAlO3/SrTiO3.
  • Electrostatic gating can tune electron density, influencing these quantum critical effects and superconductivity.