title: Momentum-resolved resonant inelastic X-ray scattering on a single crystal under high pressure.
abstract: A single-crystal momentum-resolved resonant inelastic X-ray scattering (RIXS) experiment under high pressure using an originally designed diamond anvil cell (DAC) is reported. The diamond-in/diamond-out geometry was adopted with both the incident and scattered beams passing through a 1 mm-thick diamond. This enabled us to cover wide momentum space keeping the scattering angle condition near 90°. Elastic and inelastic scattering from the diamond was drastically reduced using a pinhole placed after the DAC. Measurement of the momentum-resolved RIXS spectra of Sr2.5Ca11.5Cu24O41 at the Cu K-edge was thus successful. Though the inelastic intensity becomes weaker by two orders than the ambient pressure, RIXS spectra both at the center and the edge of the Brillouin zone were obtained at 3 GPa and low-energy electronic excitations of the cuprate were found to change with pressure.
authors.affiliation: Department of Physics, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshida
authors.affiliation: SPring-8, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ishii
authors.affiliation: SPring-8, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan.
authors.forename: Ignace
authors.initials: I
authors.lastname: Jarrige
authors.affiliation: SPring-8, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan.
authors.forename: Tetsu
authors.initials: T
authors.lastname: Watanuki
authors.affiliation: Department of Physics, Okayama University, Okayama 700-8530, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kudo
authors.affiliation: Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan.
authors.forename: Yoji
authors.initials: Y
authors.lastname: Koike
authors.affiliation: Department of Physics, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Ken'ichi
authors.initials: K
authors.lastname: Kumagai
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
authors.forename: Nozomu
authors.initials: N
authors.lastname: Hiraoka
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Ishii
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
authors.forename: Ku-Ding
authors.initials: KD
authors.lastname: Tsuei
authors.affiliation: SPring-8, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan.
authors.forename: Jun'ichiro
authors.initials: J
authors.lastname: Mizuki
keywords: diamond anvil cell; electronic excitations; high pressure; resonant inelastic X-ray scattering