TY - JOUR
T1 - Resonant inelastic x-ray scattering study of charge excitations in superconducting and nonsuperconducting PrFeAsO 1-y
AU - Jarrige, I.
AU - Nomura, T.
AU - Ishii, K.
AU - Gretarsson, H.
AU - Kim, Y. J.
AU - Kim, J.
AU - Upton, M.
AU - Casa, D.
AU - Gog, T.
AU - Ishikado, M.
AU - Fukuda, T.
AU - Yoshida, M.
AU - Hill, J. P.
AU - Liu, X.
AU - Hiraoka, N.
AU - Tsuei, K. D.
AU - Shamoto, S.
PY - 2012/9/5
Y1 - 2012/9/5
N2 - We report the first observation by momentum-resolved resonant inelastic x-ray scattering of charge excitations in an iron-based superconductor and its parent compound, PrFeAsO 0.7 and PrFeAsO, respectively, with two main results. First, using calculations based on a 16-band dp model, we show that the energy of the lowest-lying excitations, identified as dd interband transitions of dominant xz,yz orbital character, exhibits a dramatic dependence on electron correlation. This enables us to estimate the Coulomb repulsion U and Hund's coupling J, and to highlight the role played by J in these peculiar orbital-dependent electron correlation effects. Second, we show that short-range antiferromagnetic correlations, which are a prerequisite to the occurrence of these excitations at the Γ point, are still present in the superconducting state.
AB - We report the first observation by momentum-resolved resonant inelastic x-ray scattering of charge excitations in an iron-based superconductor and its parent compound, PrFeAsO 0.7 and PrFeAsO, respectively, with two main results. First, using calculations based on a 16-band dp model, we show that the energy of the lowest-lying excitations, identified as dd interband transitions of dominant xz,yz orbital character, exhibits a dramatic dependence on electron correlation. This enables us to estimate the Coulomb repulsion U and Hund's coupling J, and to highlight the role played by J in these peculiar orbital-dependent electron correlation effects. Second, we show that short-range antiferromagnetic correlations, which are a prerequisite to the occurrence of these excitations at the Γ point, are still present in the superconducting state.
UR - https://www.scopus.com/pages/publications/84866425519
UR - https://www.scopus.com/pages/publications/84866425519#tab=citedBy
U2 - 10.1103/PhysRevB.86.115104
DO - 10.1103/PhysRevB.86.115104
M3 - Article
AN - SCOPUS:84866425519
SN - 1098-0121
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
M1 - 115104
ER -