by Ishii, K., Fujita, M., Sasaki, T., Minola, M., Dellea, G., Mazzoli, C., Kummer, K., Ghiringhelli, G., Braicovich, L., Tohyama, T., Tsutsumi, K., Sato, K., Kajimoto, R. and Ikeuchi, K., Yamada, K., Yoshida, M., Kurooka, M. and Mizuki, J.
Abstract:
The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper L-3 resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone centre and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the G-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin excitations (paramagnons) recently observed in hole-doped compounds even at high doping levels.
Reference:
High-energy spin and charge excitations in electron-doped copper oxide superconductors (Ishii, K., Fujita, M., Sasaki, T., Minola, M., Dellea, G., Mazzoli, C., Kummer, K., Ghiringhelli, G., Braicovich, L., Tohyama, T., Tsutsumi, K., Sato, K., Kajimoto, R. and Ikeuchi, K., Yamada, K., Yoshida, M., Kurooka, M. and Mizuki, J.), In NATURE COMMUNICATIONS, NATURE PUBLISHING GROUP, volume 5, 2014.
Bibtex Entry:
@article{ ISI:000335223200001, Author = {Ishii, K. and Fujita, M. and Sasaki, T. and Minola, M. and Dellea, G. and Mazzoli, C. and Kummer, K. and Ghiringhelli, G. and Braicovich, L. and Tohyama, T. and Tsutsumi, K. and Sato, K. and Kajimoto, R. and Ikeuchi, K. and Yamada, K. and Yoshida, M. and Kurooka, M. and Mizuki, J.}, Title = {{High-energy spin and charge excitations in electron-doped copper oxide superconductors}}, Journal = {{NATURE COMMUNICATIONS}}, Year = {{2014}}, Volume = {{5}}, Month = {{APR}}, Abstract = {{The evolution of electronic (spin and charge) excitations upon carrier doping is an extremely important issue in superconducting layered cuprates and the knowledge of its asymmetry between electron- and hole-dopings is still fragmentary. Here we combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper L-3 resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone centre and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the G-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin excitations (paramagnons) recently observed in hole-doped compounds even at high doping levels.}}, Publisher = {{NATURE PUBLISHING GROUP}}, Address = {{MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND}}, Type = {{Article}}, Language = {{English}}, Affiliation = {{Ishii, K (Corresponding Author), Japan Atom Energy Agcy, SPring 8, Sayo, Hyogo 6795148, Japan. Ishii, K.; Yoshida, M.; Mizuki, J., Japan Atom Energy Agcy, SPring 8, Sayo, Hyogo 6795148, Japan. Fujita, M.; Sasaki, T.; Tsutsumi, K.; Sato, K., Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan. Minola, M.; Dellea, G.; Mazzoli, C.; Ghiringhelli, G.; Braicovich, L., Politecn Milan, CNR SPIN, I-20133 Milan, Italy. Minola, M.; Dellea, G.; Mazzoli, C.; Ghiringhelli, G.; Braicovich, L., Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy. Kummer, K., European Synchrotron Radiat Facil, F-38043 Grenoble, France. Tohyama, T., Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan. Kajimoto, R., Japan Atom Energy Agcy, J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan. Ikeuchi, K., Comprehens Res Org Sci & Soc, Res Ctr Neutron Sci & Technol, Tokai, Ibaraki 3191106, Japan. Yamada, K., High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan. Yoshida, M.; Kurooka, M.; Mizuki, J., Kwansei Gakuin Univ, Sch Sci & Technol, Sanda, Hyogo 6691337, Japan.}}, DOI = {{10.1038/ncomms4714}}, Article-Number = {{3714}}, ISSN = {{2041-1723}}, Keywords-Plus = {{MAGNETIC EXCITATIONS; WAVES}}, Research-Areas = {{Science & Technology - Other Topics}}, Web-of-Science-Categories = {{Multidisciplinary Sciences}}, Author-Email = {{kenji@spring8.or.jp fujita@imr.tohoku.ac.jp}}, ResearcherID-Numbers = {{Tohyma, Takami/F-8212-2018 Ishii, Kenji/G-3453-2017 Fujita, Masaki/D-8430-2013 Ghiringhelli, Giacomo/D-1159-2014 }}, ORCID-Numbers = {{Tohyma, Takami/0000-0002-4679-7719 Ishii, Kenji/0000-0002-6465-8202 Ghiringhelli, Giacomo/0000-0003-0867-7748 Mazzoli, Claudio/0000-0001-9774-1507 Kajimoto, Ryoichi/0000-0003-4845-5947 Minola, Matteo/0000-0003-4084-0664 Braicovich, Lucio/0000-0001-6548-9140}}, Funding-Acknowledgement = {{INS experiments at J-PARC {[}2012P0201]; JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) {[}25400333, 23340093, 22340097]; Italian Ministry of Research (MIUR)Ministry of Education, Universities and Research (MIUR); Strategic Programs for Innovative Research (SPIRE)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Computational Materials Science Initiative (CMSI) from MEXT; Grants-in-Aid for Scientific ResearchMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) {[}22244039, 23340093, 22340097] Funding Source: KAKEN}}, Funding-Text = {{We acknowledge K. Tsutsui, E. Kaneshita, S. Wakimoto, and H. Kimura for invaluable discussion. We also thank H. Kimura for sample preparation and N.B. Brookes for the support at the beam line ID08 of the European Synchrotron Radiation Facility (ESRF). The Cu L<INF>3</INF> RIXS experiments were performed at the beam line ID08 of the ESRF using the AXES spectrometer and we acknowledge the ESRF for provision of synchrotron radiation facilities. The INS experiments at J-PARC were carried out under Project No. 2012P0201. The Cu K-edge RIXS experiments at SPring-8 were performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposals No. 2012B3502). This work is financially supported by JSPS KAKENHI Grant Number 25400333, 23340093 and 22340097. G.D., G.G. and L.B. are supported by the Italian Ministry of Research (MIUR) through the PIK-POLARIX project. T.T. is supported by Strategic Programs for Innovative Research (SPIRE), the Computational Materials Science Initiative (CMSI) from MEXT, and K. Is., M.F. and T.T. acknowledge YIPQS Molecule-type workshop at YITP. This work was partly performed under the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposal No. 12K0092).}}, Number-of-Cited-References = {{31}}, Times-Cited = {{65}}, Usage-Count-Last-180-days = {{0}}, Usage-Count-Since-2013 = {{53}}, Journal-ISO = {{Nat. Commun.}}, Doc-Delivery-Number = {{AG2CM}}, Unique-ID = {{ISI:000335223200001}}, OA = {{DOAJ Gold, Green Published}}, DA = {{2020-12-22}}, }
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