1. Phase coherence and pairing amplitude in photo-excited superconductors
- Author
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Luca Perfetti, Zailan Zhang, and Christian Piovera
- Subjects
Superconductivity ,Physics ,Superconducting coherence length ,Phase transition ,High-temperature superconductivity ,Condensed matter physics ,Scattering ,02 engineering and technology ,Inelastic scattering ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,law ,Condensed Matter::Superconductivity ,Pairing ,0103 physical sciences ,Quasiparticle ,010306 general physics ,0210 nano-technology - Abstract
New data on Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) reveal interesting aspects of photoexcited superconductors. The electrons dynamics show that inelastic scattering by nodal quasiparticles decreases when the temperature is lowered below the critical value of the superconducting phase transition. This drop of electronic dissipation is astonishingly robust and survives to photoexcitation densities much larger than the value sustained by long-range superconductivity. The unconventional behavior of quasiparticle scattering is ascribed to superconducting correlations extending on a length scale comparable to the inelastic mean-free path. Our measurements indicate that strongly driven superconductors enter in a regime without phase coherence but finite pairing amplitude.
- Published
- 2016
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