Crossover from collective to incoherent spin excitations in superconducting cuprates probed by detuned resonant inelastic X-ray scattering
Spin excitations in the overdoped high temperature superconductors Tl2Ba2CuO6+δ and (Bi,Pb)2(Sr,La)2CuO6+δ were investigated by resonant inelastic x-ray scattering (RIXS) as functions of doping and detuning of the incoming photon energy above the Cu−L3 absorption peak. The RIXS spectra at optimal do...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
31 August 2017
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| In: |
Physical review letters
Year: 2017, Volume: 119, Issue: 9 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.119.097001 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.119.097001 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.119.097001 
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| Author Notes: | M. Minola, Y. Lu, Y.Y. Peng, G. Dellea, H. Gretarsson, M.W. Haverkort, Y. Ding, X. Sun, X. J. Zhou, D. C. Peets, L. Chauviere, P. Dosanjh, D. A. Bonn, R. Liang, A. Damascelli, M. Dantz, X. Lu, T. Schmitt, L. Braicovich, G. Ghiringhelli, B. Keimer, and M. Le Tacon |
| Summary: | Spin excitations in the overdoped high temperature superconductors Tl2Ba2CuO6+δ and (Bi,Pb)2(Sr,La)2CuO6+δ were investigated by resonant inelastic x-ray scattering (RIXS) as functions of doping and detuning of the incoming photon energy above the Cu−L3 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. |
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| Item Description: | Gesehen am 03.11.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.119.097001 |