Mobile orbitons in Ca2CuO3: Crucial role of Hund's exchange

Fumagalli, R.; Heverhagen, J.; Betto, D.; Arpaia, R.; Rossi, M.; Di Castro, D.; Brookes, N. B.; Moretti Sala, M.; Daghofer, M.; Braicovich, L.; Wohlfeld, K.; Ghiringhelli, G.

doi:10.1103/physrevb.101.205117

Mobile orbitons in ${Ca}_{2} {CuO}_{3}$ : Crucial role of Hund's exchange

Journal Article · Tue May 12 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.205117· OSTI ID:1632108

Fumagalli, R. ^[1]; Heverhagen, J. ^[2]; Betto, D. ^[3]; ^[1]; ^[1]; Di Castro, D. ^[4]; Brookes, N. B. ^[3]; Moretti Sala, M. ^[1]; ^[2]; Braicovich, L. ^[5]; ^[6]; ^[1]

Politecnico di Milano (Italy)
Univ. of Stuttgart (Germany)
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Univ. di Roma Tor Vergata, Roma (Italy)
Politecnico di Milano (Italy); European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Univ. of Warsaw (Poland)

We investigate the Cu L₃ edge resonant inelastic x-ray scattering (RIXS) spectra of a quasi-1D antiferromagnet Ca₂CuO₃. In addition to the magnetic excitations, which are well-described by the two-spinon continuum, we observe two dispersive orbital excitations, the 3d_xy and the 3d_yz orbitons. We carry out a quantitative comparison of the RIXS spectra, obtained with two distinct incident polarizations, with a theoretical model. We show that any realistic spin-orbital model needs to include a finite, but realistic, Hund's exchange J_H ≈ 0.5 eV . Its main effect is an increase in orbiton velocities, so that their theoretically calculated values match those observed experimentally. Even though Hund's exchange also mediates some interaction between spinon and orbiton, the picture of spin-orbit separation remains intact and describes orbiton motion in this compound.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1632108

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Mobile orbitons in Ca2CuO3 : Crucial role of Hund's exchange

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Mobile orbitons in ${Ca}_{2} {CuO}_{3}$ : Crucial role of Hund's exchange