Emergence of light-induced superconducting-like state from the charge density wave state in high-Tc cuprate superconductors

Morihiko Nishida; Dongjoon Song; Alannah M. Hallas; Hiroshi Eisaki; Ryo Shimano

doi:10.1103/PhysRevB.110.224515

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Emergence of light-induced superconducting-like state from the charge density wave state in high-Tc cuprate superconductors

Morihiko Nishida, Dongjoon Song, Alannah M. Hallas, Hiroshi Eisaki, Ryo Shimano

DOI 10.1103/PhysRevB.110.224515 · Physical Review B

T1

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Abstract

We performed a comprehensive study of light-induced superconducting-like responses in La-based cuprate superconductors, La2−x−yNdySrxCuO4, which exhibit charge stripe orders or a short-range charge density wave (CDW) order depending on the concentration of Nd and Sr, by using near-infrared optical pump and terahertz probe spectroscopy. The light-induced plasma edge was observed in the c-axis terahertz reflectivity for all the samples far above Tc, regardless of long-range stripe or short-range CDW order. Remarkably, the frequency of light-induced plasma edge above Tc coincides with that of Josephson plasma resonance of La2−xSrxCuO4 at the similar doping in the low-temperature superconducting phase, imposing a strong constraint on the interpretation of the phenomenon. We elucidated a close correlation between the emergence of the light-induced c-axis plasma edge and the CDW order or fluctuations in the temperature-doping phase diagram, unveiling the intimate interplay between the equilibrium CDW and the light-induced coherent charge carriers along the c axis in nonequilibrium. The possibility of the existence of incoherent Cooper pairs above Tc that show up upon the photoexcitation is discussed from the optical conductivity analysis.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.6-xNd0.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.2	Pressure not reported	onset
La1.6-xNd0.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	onset
La1.6-xNd0.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.7	Pressure not reported	onset
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28.4	Pressure not reported	onset
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32.8	Pressure not reported	onset
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35.9	Pressure not reported	onset
La1.48Nd0.4Sr0.12CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown