Dispersion, damping, and intensity of spin excitations in the monolayer (Bi,Pb)2(Sr,La)2CuO6+δ cuprate superconductor family

Peng, Y. Y.; Huang, E. W.; Fumagalli, R.; Minola, M.; Wang, Y.; Sun, X.; Ding, Y.; Kummer, K.; Zhou, X. J.; Brookes, N. B.; Moritz, B.; Braicovich, L.; Devereaux, T. P.; Ghiringhelli, G.

doi:10.1103/physrevb.98.144507

Title: Dispersion, damping, and intensity of spin excitations in the monolayer ${(Bi,Pb)}_{2} {(Sr,La)}_{2} {CuO}_{6 + δ}$ cuprate superconductor family

Journal Article · Wed Oct 10 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.98.144507· OSTI ID:1490392

Peng, Y. Y. ^[1]; Huang, E. W. ^[2]; Fumagalli, R. ^[1]; Minola, M. ^[3]; Wang, Y. ^[4]; Sun, X. ^[5]; Ding, Y. ^[5]; Kummer, K. ^[6]; Zhou, X. J. ^[5]; Brookes, N. B. ^[6]; Moritz, B. ^[7]; Braicovich, L. ^[6]; Devereaux, T. P. ^[7]; Ghiringhelli, G. ^[8]

Politecnico di Milano (Italy). Dept. of Physics
Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
Max Planck Inst. for Solid State Research, Stuttgart (Germany)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Harvard Univ., Cambridge, MA (United States). Dept. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics. Inst. of Physics
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
Politecnico di Milano (Italy). Dept. of Physics. Superconducting and Other Innovative Materials and Devices Inst. (CNR-SPIN)

Using Cu-$${L}_{3}$$ edge resonant inelastic x-ray scattering (RIXS) we measured here the dispersion and damping of spin excitations (magnons and paramagnons) in the high-$${T}_{\mathrm{c}}$$ superconductor $${(\text{Bi,Pb})}_{2}{(\text{Sr,La})}_{2}{\mathrm{CuO}}_{6+{\delta}}$$ (Bi2201), for a large doping range across the phase diagram $$(0.03{\lesssim}p{\lesssim}0.21)$$. Selected measurements with full polarization analysis unambiguously demonstrate the spin-flip character of these excitations, even in the overdoped sample. We find that the undamped frequencies increase slightly with doping for all accessible momenta, while the damping grows rapidly, faster in the $$(0,0){\rightarrow}(0.5,0.5)$$ nodal direction than in the $$(0,0){\rightarrow}(0.5,0)$$ antinodal direction. We compare the experimental results to numerically exact determinant quantum Monte Carlo (DQMC) calculations that provide the spin dynamical structure factor $$S(\mathbf{Q},{\omega})$$ of the three-band Hubbard model. The theory reproduces well the momentum and doping dependence of the dispersions and spectral weights of magnetic excitations. These results provide compelling evidence that paramagnons, although increasingly damped, persist across the superconducting dome of the cuprate phase diagram; this implies that long-range antiferromagnetic correlations are quickly washed away, while short-range magnetic interactions are little affected by doping.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Politecnico di Milano (Italy); Max Planck Inst. for Solid State Research, Stuttgart (Germany); Chinese Academy of Sciences (CAS), Beijing (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); European Research Council (ERC); Alexander von Humboldt Foundation (Germany); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Chinese Academy of Sciences

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231; 2016-0790; 11334010; 11534007; 2016YFA0300300; XDB07020300

OSTI ID:: 1490392

Alternate ID(s):: OSTI ID: 1477542

Journal Information:: Physical Review B, Vol. 98, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Title: Dispersion, damping, and intensity of spin excitations in the monolayer ( Bi,Pb ) 2 ( Sr,La ) 2 CuO 6 + δ cuprate superconductor family

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Title: Dispersion, damping, and intensity of spin excitations in the monolayer ${(Bi,Pb)}_{2} {(Sr,La)}_{2} {CuO}_{6 + δ}$ cuprate superconductor family