Light-induced nonequilibrium response of the superconducting cuprate La2−xSrxCuO4
Hiroaki Niwa, Naotaka Yoshikawa, Kaito Tomari, Ryusuke Matsunaga, Dongjoon Song, Hiroshi Eisaki, Ryo Shimano
DOI 10.1103/PhysRevB.100.104507 · Physical Review B
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Abstract
We report the dynamics of the cuprate superconductor La2−xSrxCuO4 (x=0.14) after intense photoexcitation utilizing near-infrared (800nm) optical pump-terahertz probe spectroscopy. In the superconducting state at 5K, we observed a redshift of the Josephson plasma resonance that sustains for hundreds of picoseconds after the photoexcitation, indicating the destruction of the c-axis superconducting coherence. We show that the metastable spectral features can be described by the photoinduced surface heating of the sample. We also demonstrate that the conventional analysis used to extract the spectra of the photoexcited surface region can give rise to artifacts in the nonequilibrium response.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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