Determination of Hund's coupling in 5d oxides using resonant inelastic x-ray scattering

Yuan, Bo; Clancy, J. P.; Cook, A. M.; Thompson, C. M.; Greedan, J.; Cao, G.; Jeon, B. C.; Noh, T. W.; Upton, M. H.; Casa, D.; Gog, T.; Paramekanti, A.; Kim, Young-June

doi:10.1103/PhysRevB.95.235114

Determination of Hund's coupling in $5 d$ oxides using resonant inelastic x-ray scattering

Journal Article · Thu Jun 01 04:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.235114· OSTI ID:1376704

Yuan, Bo; Clancy, J. P.; Cook, A. M.; Thompson, C. M.; Greedan, J.; Cao, G.; Jeon, B. C.; Noh, T. W.; Upton, M. H.; Casa, D.; Gog, T.; Paramekanti, A.; Kim, Young-June

We report resonant inelastic x-ray scattering (RIXS) measurements on ordered double-perovskite samples containing Re5+ and Ir5+ with 5d(2) and 5d(4) electronic configurations, respectively. In particular, the observedRIXS spectra of Ba2YReO6 and Sr2MIrO6 (M = Y, Gd) show sharp intra-t(2g) transitions, which can be quantitatively understood using a minimal "atomic" Hamiltonian incorporating spin-orbit coupling. and Hund's coupling J(H). Our analysis yields lambda = 0.38(2) eV with J(H) = 0.26(2) eV for Re5+ and lambda = 0.42(2) eV with J(H) = 0.25(4) eV for Ir5+. Our results provide sharp estimates for Hund's coupling in 5d oxides and suggest that it should be treated on equal footing with spin-orbit interaction in multiorbital 5d transition-metal compounds.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: Institute for Basic Science; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1376704

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 95; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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