by Ghiringhelli, G., Piazzalunga, A., Dallera, C., Schmitt, T. and Strocov, V. N., Schlappa, J., Patthey, L., Wang, X., Berger, H. and Grioni, M.
Abstract:
We present high resolution (Delta E=120 meV) resonant inelastic x-ray scattering data measured at the Ni L-3 edge (2p(3/2)-> 3d) on the paradigmatic antiferromagnetic oxide NiO. Spectra reveal clear signatures of magnetic excitations at similar to 95 and similar to 190 meV whose energy seems independent from transferred momentum. These spectral features are well reproduced by a single Ni2+ ion model in an effective exchange field. Within this local model the two magnetic excitations are characterized by a variation of the atomic magnetic moment along the local ordering direction (Delta S-alpha) of one and two units. The Delta S-alpha=2 case has different nature from bimagnons observed in optical Raman spectra, for which Delta S-alpha=0.
Reference:
Observation of Two Nondispersive Magnetic Excitations in NiO by Resonant Inelastic Soft-X-Ray Scattering (Ghiringhelli, G., Piazzalunga, A., Dallera, C., Schmitt, T. and Strocov, V. N., Schlappa, J., Patthey, L., Wang, X., Berger, H. and Grioni, M.), In PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, volume 102, 2009.
Bibtex Entry:
@article{ ISI:000262535900068, Author = {Ghiringhelli, G. and Piazzalunga, A. and Dallera, C. and Schmitt, T. and Strocov, V. N. and Schlappa, J. and Patthey, L. and Wang, X. and Berger, H. and Grioni, M.}, Title = {{Observation of Two Nondispersive Magnetic Excitations in NiO by Resonant Inelastic Soft-X-Ray Scattering}}, Journal = {{PHYSICAL REVIEW LETTERS}}, Year = {{2009}}, Volume = {{102}}, Number = {{2}}, Month = {{JAN 16}}, Abstract = {{We present high resolution (Delta E=120 meV) resonant inelastic x-ray scattering data measured at the Ni L-3 edge (2p(3/2)-> 3d) on the paradigmatic antiferromagnetic oxide NiO. Spectra reveal clear signatures of magnetic excitations at similar to 95 and similar to 190 meV whose energy seems independent from transferred momentum. These spectral features are well reproduced by a single Ni2+ ion model in an effective exchange field. Within this local model the two magnetic excitations are characterized by a variation of the atomic magnetic moment along the local ordering direction (Delta S-alpha) of one and two units. The Delta S-alpha=2 case has different nature from bimagnons observed in optical Raman spectra, for which Delta S-alpha=0.}}, 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, CNR INFM Coherentia & Soft, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy. Ghiringhelli, G.; Piazzalunga, A.; Dallera, C., Politecn Milan, Dipartimento Fis, CNR INFM Coherentia & Soft, I-20133 Milan, Italy. Schmitt, T.; Strocov, V. N.; Schlappa, J.; Patthey, L., Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Wang, X.; Berger, H.; Grioni, M., Ecole Polytech Fed Lausanne, Inst Phys Nanostruct, CH-1015 Lausanne, Switzerland.}}, DOI = {{10.1103/PhysRevLett.102.027401}}, Article-Number = {{027401}}, ISSN = {{0031-9007}}, EISSN = {{1079-7114}}, Keywords-Plus = {{OPTICAL-ABSORPTION; RAMAN-SCATTERING; WAVE DISPERSION}}, Research-Areas = {{Physics}}, Web-of-Science-Categories = {{Physics, Multidisciplinary}}, ResearcherID-Numbers = {{Patthey, Luc/G-6130-2018 Ghiringhelli, Giacomo/D-1159-2014 Schmitt, Thorsten/A-7025-2010}}, ORCID-Numbers = {{Patthey, Luc/0000-0001-6101-8069 Ghiringhelli, Giacomo/0000-0003-0867-7748 }}, Funding-Acknowledgement = {{Swiss NSFSwiss National Science Foundation (SNSF); NCCR MaNEPSwiss National Science Foundation (SNSF)}}, Funding-Text = {{This work was performed at the ADRESS beam line of the SLS ( PSI) using the SAXES spectrometer developed jointly by Politecnico di Milano, SLS, and EPFL. Technical support by M. Kropf and J. Krempasky and all the SLS staff is gratefully acknowledged. Work at the EPFL is supported by the Swiss NSF and by the NCCR MaNEP. G. G. is indebted to L. Braicovich, J. van den Brink, and L. Ament for illuminating discussions.}}, Number-of-Cited-References = {{22}}, Times-Cited = {{55}}, Usage-Count-Last-180-days = {{1}}, Usage-Count-Since-2013 = {{25}}, Journal-ISO = {{Phys. Rev. Lett.}}, Doc-Delivery-Number = {{395PL}}, Unique-ID = {{ISI:000262535900068}}, OA = {{Green Accepted}}, DA = {{2020-12-22}}, }
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