Bosonic excitations and electron pairing in an electron-doped cuprate superconductor

M. C. Wang; H. S. Yu; J. Xiong; Y.-F. Yang; S. N. Luo; K. Jin; J. Qi

doi:10.1103/PhysRevB.97.155157

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Bosonic excitations and electron pairing in an electron-doped cuprate superconductor

M. C. Wang, H. S. Yu, J. Xiong, Y.-F. Yang, S. N. Luo, K. Jin, J. Qi

DOI 10.1103/PhysRevB.97.155157 · Physical Review B

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Abstract

By applying ultrafast optical spectroscopy to electron-doped La1.9Ce0.1CuO4±δ, we discern a bosonic mode of electronic origin and provide the evolution of its coupling with the charge carriers as a function of temperature. Our results show that it has the strongest coupling strength near Tc and can fully account for the superconducting pairing. This mode can be associated with the two-dimensional antiferromagnetic spin correlations emerging below a critical temperature T† larger than Tc. Our work may help to establish a quantitative relation between bosonic excitations and superconducting pairing in electron-doped cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.9Ce0.1CuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.1	Pressure not reported	onset