High-energy spin and charge excitations in electron-doped copper oxide superconductors

K. Ishii (), M. Fujita (), T. Sasaki, M. Minola, G. Dellea, C. Mazzoli, K. Kummer, G. Ghiringhelli, L. Braicovich, T. Tohyama, K. Tsutsumi, K. Sato, R. Kajimoto, K. Ikeuchi, K. Yamada, M. Yoshida, M. Kurooka and J. Mizuki
Additional contact information
K. Ishii: SPring-8, Japan Atomic Energy Agency, Sayo
M. Fujita: Institute for Materials Research, Tohoku University, Katahira
T. Sasaki: Institute for Materials Research, Tohoku University, Katahira
M. Minola: Politecnico di Milano
G. Dellea: Politecnico di Milano
C. Mazzoli: Politecnico di Milano
K. Kummer: European Synchrotron Radiation Facility
G. Ghiringhelli: Politecnico di Milano
L. Braicovich: Politecnico di Milano
T. Tohyama: Yukawa Institute for Theoretical Physics, Kyoto University
K. Tsutsumi: Institute for Materials Research, Tohoku University, Katahira
K. Sato: Institute for Materials Research, Tohoku University, Katahira
R. Kajimoto: J-PARC Center, Japan Atomic Energy Agency, Tokai
K. Ikeuchi: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society, Tokai
K. Yamada: Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba
M. Yoshida: SPring-8, Japan Atomic Energy Agency, Sayo
M. Kurooka: School of Science and Technology, Kwansei Gakuin University, Sanda
J. Mizuki: SPring-8, Japan Atomic Energy Agency, Sayo

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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 L3 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 Γ-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.

Date: 2014
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DOI: 10.1038/ncomms4714

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