Feedback effect on high-energy magnetic fluctuations in the model high-temperature superconductor HgBa 2CuO 4+δ observed by electronic Raman scattering

Yuan Li, M. Le Tacon, M. Bakr, D. Terrade, D. Manske, R. Hackl, L. Ji, M. K. Chan, N. Bariić, X. Zhao, M. Greven, B. Keimer

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Abstract

We use electronic Raman scattering to study the model single-layer cuprate superconductor HgBa 2CuO 4+δ. 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 T c. 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 high-energy magnetic fluctuations in the pairing mechanism. All of these effects occur already above T c in two underdoped samples, demonstrating a related feedback mechanism associated with the pseudogap.

Original languageEnglish (US)
Article number227003
JournalPhysical review letters
Volume108
Issue number22
DOIs
StatePublished - May 31 2012

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