Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature Superconductor HgBa2CuO4+δ Observed by Electronic Raman Scattering (CROSBI ID 181304)
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Podaci o odgovornosti
Li, Y. ; le Tacon, M. ; Bakr, M. ; Terrade, D. ; Manske, D. ; Hackl, R. ; Ji, L. ; Chan, M.K. ; Barišić, Neven ; Zhao, X. ; Greven, M. ; Keimer, B.
engleski
Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature Superconductor HgBa2CuO4+δ Observed by Electronic Raman Scattering
We use electronic Raman scattering to study the model single-layer cuprate superconductor HgBa2CuO4þ. In an overdoped sample, we observe a pronounced amplitude enhancement of a high-energy peak related to two-magnon excitations in insulating cuprates upon cooling below the critical temperature Tc. This effect is accompanied by the appearance of the superconducting gap and a pairing peak above the gap in the Raman spectrum, and it can be understood as a hitherto-undetected feedback effect on the high-energy magnetic fluctuations due to the Cooper pairing interaction. This implies a direct involvement of the highenergy magnetic fluctuations in the pairing mechanism. All of these effects occur already above Tc in two underdoped samples, demonstrating a related feedback mechanism associated with the pseudogap.
74.25.nd; 74.40.n; 74.72.Gh; 74.72.Kf
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Podaci o izdanju
108 (22)
2012.
227003-1-227003-6
objavljeno
0031-9007
10.1103/PhysRevLett.108.227003