Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi2Sr2CaCu2O8+δ

Laurène Gatuingt; Alexandr Alekhin; Niloufar Nilforoushan; Sarah Houver; Alain Sacuto; Genda Gu; Yann Gallais

doi:10.1103/wkx7-lcqf

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Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi2Sr2CaCu2O8+δ

Laurène Gatuingt, Alexandr Alekhin, Niloufar Nilforoushan, Sarah Houver, Alain Sacuto, Genda Gu, Yann Gallais

DOI 10.1103/wkx7-lcqf · Physical Review B

T1

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Abstract

We report an ultrafast Time-Resolved Raman scattering study of the out-of-equilibrium photoinduced dynamics across the superconducting to normal state phase transition of the cuprate Bi2Sr2CaCu2O8+δ. Using the polarization-resolved momentum space selectivity of Raman scattering, we track the superconducting condensate destruction and recovery dynamics with subpicoseconds time resolution in the antinodal region of the Fermi surface where the superconducting gap is maximum. Leveraging ultrafast Raman thermometry, we find a significant dichotomy between the superconducting condensate and the quasiparticle temperature dynamics near the antinodes, which cannot be framed in terms of a single effective electron temperature. The present work demonstrates the ability of Time-Resolved Raman scattering to selectively probe out-of-equilibrium pathways of different electronic subdegrees of freedom during a photoinduced phase transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown