Crossover from Collective to Incoherent Spin Excitations in Superconducting 
Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering

Minola, M.; Lu, Y.; Peng, Y. Y.; Dellea, G.; Gretarsson, H.; Haverkort, M. W.; Ding, Y.; Sun, X.; Zhou, X. J.; Peets, D. C.; Chauviere, L.; Dosanjh, P.; Bonn, D. A.; Liang, R.; Damascelli, A.; Dantz, M.; Lu, X.; Schmitt, T.; Braicovich, L.; Ghiringhelli, G.; Keimer, B.; Le Tacon, M.

doi:10.1103/PhysRevLett.119.097001

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Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering

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Haverkort, M. W.
Maurits Haverkort, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Minola, M., Lu, Y., Peng, Y. Y., Dellea, G., Gretarsson, H., Haverkort, M. W., et al. (2017). Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-Ray Scattering. Physical Review Letters, 119(9): 097001, pp. 1-6. doi:10.1103/PhysRevLett.119.097001.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-F1D0-3

Abstract

Spin excitations in the overdoped high temperature superconductors Tl2Ba2CuO6+delta and (Bi,Pb)(2)(Sr,La)(2)CuO6+delta were investigated by resonant inelastic x-ray scattering (RIXS) as functions of doping and detuning of the incoming photon energy above the Cu-L-3 absorption peak. The RIXS spectra at optimal doping are dominated by a paramagnon feature with peak energy independent of photon energy, similar to prior results on underdoped cuprates. Beyond optimal doping, the RIXS data indicate a sharp crossover to a regime with a strong contribution from incoherent particle-hole excitations whose maximum shows a fluorescencelike shift upon detuning. The spectra of both compound families are closely similar, and their salient features are reproduced by exact-diagonalization calculations of the single-band Hubbard model on a finite cluster. The results are discussed in the light of recent transport experiments indicating a quantum phase transition near optimal doping.