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

Abstract

Spin excitations in the overdoped high temperature superconductors Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$ and (Bi,Pb)${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$ 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 fluorescence-like 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.

6 pages, 3 figures, accepted in Physical Review Letters

References in corpus (7)

• Controlling many-body states by the electric-field effect in a two-dimensional material
• Ground state oxygen holes and the metal-insulator transition in the negative charge transfer rare-earth nickelates
• Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
• Bands, resonances, edge singularities and excitons in core level spectroscopy investigated within the dynamical mean field theory
• The simultaneous measurement of energy and linear polarization of the scattered radiation in resonant inelastic soft x-ray scattering
• Collapse of ferromagnetism and Fermi surface instability near reentrant superconductivity of URhGe
• Growth, characterization and physical properties of high-quality large single crystals of Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ high-temperature superconductors

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