by Fumagalli, R., Braicovich, L., Minola, M., Peng, Y. Y. and Kummer, K., Betto, D., Rossi, M., Lefrancois, E., Morawe, C., Salluzzo, M., Suzuki, H., Yakhou, F., Le Tacon, M. and Keimer, B., Brookes, N. B., Sala, M. Moretti and Ghiringhelli, G.
Abstract:
High-resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength lies in the large Cu L-3 resonance and in the fact that the scattering cross section follows quite closely the single-ion model predictions, both in the insulating parent compounds and in the superconducting doped materials. However, the spectra become increasingly broader with (hole) doping, hence resolving and assigning spectral features has proven challenging even with the highest energy resolution experimentally achievable. Here we have overcome this limitation by measuring the polarization dependence of the RIXS spectra as a function of momentum transfer and doping in thin films of NdBa2Cu3O7-delta. Besides confirming the previous assignment of dd and spin excitations (magnon, bimagnon) in the antiferromagnetic insulating parent compound, we unequivocally single out the actual spin-flip contribution at all dopings. We also demonstrate that the softening of dd excitations is mainly attributed to the shift of the xy peak to lower energy loss. These results provide a definitive assessment of the RIXS spectra of cuprates and demonstrate that RIXS measurements with polarization control are practically feasible and highly informative.
Reference:
Polarization-resolved Cu L-3-edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7-delta (Fumagalli, R., Braicovich, L., Minola, M., Peng, Y. Y. and Kummer, K., Betto, D., Rossi, M., Lefrancois, E., Morawe, C., Salluzzo, M., Suzuki, H., Yakhou, F., Le Tacon, M. and Keimer, B., Brookes, N. B., Sala, M. Moretti and Ghiringhelli, G.), In PHYSICAL REVIEW B, AMER PHYSICAL SOC, volume 99, 2019.
Bibtex Entry:
@article{ ISI:000466381200006, Author = {Fumagalli, R. and Braicovich, L. and Minola, M. and Peng, Y. Y. and Kummer, K. and Betto, D. and Rossi, M. and Lefrancois, E. and Morawe, C. and Salluzzo, M. and Suzuki, H. and Yakhou, F. and Le Tacon, M. and Keimer, B. and Brookes, N. B. and Sala, M. Moretti and Ghiringhelli, G.}, Title = {{Polarization-resolved Cu L-3-edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7-delta}}, Journal = {{PHYSICAL REVIEW B}}, Year = {{2019}}, Volume = {{99}}, Number = {{13}}, Month = {{APR 23}}, Abstract = {{High-resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength lies in the large Cu L-3 resonance and in the fact that the scattering cross section follows quite closely the single-ion model predictions, both in the insulating parent compounds and in the superconducting doped materials. However, the spectra become increasingly broader with (hole) doping, hence resolving and assigning spectral features has proven challenging even with the highest energy resolution experimentally achievable. Here we have overcome this limitation by measuring the polarization dependence of the RIXS spectra as a function of momentum transfer and doping in thin films of NdBa2Cu3O7-delta. Besides confirming the previous assignment of dd and spin excitations (magnon, bimagnon) in the antiferromagnetic insulating parent compound, we unequivocally single out the actual spin-flip contribution at all dopings. We also demonstrate that the softening of dd excitations is mainly attributed to the shift of the xy peak to lower energy loss. These results provide a definitive assessment of the RIXS spectra of cuprates and demonstrate that RIXS measurements with polarization control are practically feasible and highly informative.}}, Publisher = {{AMER PHYSICAL SOC}}, Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}}, Type = {{Article}}, Language = {{English}}, Affiliation = {{Ghiringhelli, G (Corresponding Author), Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy. Ghiringhelli, G (Corresponding Author), Politecn Milan, CNR, SPIN, Dipartimento Fis, I-20133 Milan, Italy. Fumagalli, R.; Braicovich, L.; Peng, Y. Y.; Rossi, M.; Sala, M. Moretti; Ghiringhelli, G., Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy. Braicovich, L.; Kummer, K.; Betto, D.; Morawe, C.; Yakhou, F.; Brookes, N. B., European Synchrotron, ESRF, BP 220, F-38043 Grenoble, France. Minola, M.; Betto, D.; Lefrancois, E.; Suzuki, H.; Keimer, B., Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany. Salluzzo, M., CNR, SPIN, Complesso Monte Santangelo,Via Cinthia, I-80126 Naples, Italy. Le Tacon, M., Karlsruhe Inst Technol, Inst Solid State Phys IFP, D-76021 Karlsruhe, Germany. Ghiringhelli, G., Politecn Milan, CNR, SPIN, Dipartimento Fis, I-20133 Milan, Italy. Peng, Y. Y., Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Peng, Y. Y., Univ Illinois, Seitz Mat Res Lab, Urbana, IL 61801 USA.}}, DOI = {{10.1103/PhysRevB.99.134517}}, Article-Number = {{134517}}, ISSN = {{2469-9950}}, EISSN = {{2469-9969}}, Keywords-Plus = {{PAIRING INTERACTION; TEMPERATURE; SUPERCONDUCTIVITY; CALCULUS; OXYGEN}}, Research-Areas = {{Materials Science; Physics}}, Web-of-Science-Categories = {{Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter}}, Author-Email = {{giacomo.ghiringhelli@polimi.it}}, ResearcherID-Numbers = {{Lefrancois, Emilie/Q-4316-2019 Ghiringhelli, Giacomo/D-1159-2014 , Le Tacon Matthieu/D-8023-2011 }}, ORCID-Numbers = {{Lefrancois, Emilie/0000-0002-8959-7848 Ghiringhelli, Giacomo/0000-0003-0867-7748 , Le Tacon Matthieu/0000-0002-5838-3724 Minola, Matteo/0000-0003-4084-0664}}, Funding-Acknowledgement = {{ERC-P-ReXS Project of the Fondazione CARIPLO, Regione Lombardia {[}2016-0790]; MIUR Italian Ministry for Research through project PIK Polarix; Alexander von Humboldt FoundationAlexander von Humboldt Foundation}}, Funding-Text = {{The experimental data were collected at the beam line ID32 of the European Synchrotron (ESRF) in Grenoble (France) using the ERIXS spectrometer designed jointly by the ESRF and the Politecnico di Milano. This work was supported by ERC-P-ReXS Project No. 2016-0790 of the Fondazione CARIPLO, Regione Lombardia and by MIUR Italian Ministry for Research through project PIK Polarix. M. M. and H. S. were partially supported by the Alexander von Humboldt Foundation.}}, Number-of-Cited-References = {{63}}, Times-Cited = {{12}}, Usage-Count-Last-180-days = {{4}}, Usage-Count-Since-2013 = {{18}}, Journal-ISO = {{Phys. Rev. B}}, Doc-Delivery-Number = {{HW0OR}}, Unique-ID = {{ISI:000466381200006}}, DA = {{2020-12-22}}, }
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