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Ishii, Kenji; Ishihara, Sumio; Murakami, Youichi; Ikeuchi, Ken; Kuzushita, Kaori; Inami, Toshiya; Ohwada, Kenji; Yoshida, Masahiro; Jarrige, Ignace; Tatami, N.; Niioka, S.; Bizen, Daisuke; Ando, Yasuo; Мizuki, J.; Maekawa, Sadamichi; Endoh, Y.

doi:10.1103/physrevb.83.241101

Cited by 26 publications

(18 citation statements)

References 28 publications

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“…This is an analogous to spin-wave excitation in a magnetically ordered state. Several experimental observations of orbiton by optical and Raman spectroscopies, [3][4][5][6][7] x-ray scatterings [8][9][10][11][12] and other experimental probes, as well as theoretical supports [13][14][15][16][17] have been reported so far. Nonetheless, characteristics of orbiton have not been revealed yet.…”

Section: Introductionmentioning

confidence: 94%

Vibronic excitation dynamics in orbitally degenerate correlated electron system

Nasu

Ishihara

2013

Phys. Rev. B

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Orbital-lattice coupled excitation dynamics in orbitally degenerate correlated systems are examined. We present a theoretical framework, where both local vibronic excitations and superexchange-type inter-site interactions are dealt with on an equal footing. We generalize the spin-wave approximation so as to take local vibronic states into account. Present method is valid from weak to strong Jahn-Teller coupling magnitudes. Two characteristic excitation modes coexist; a low-energy dispersive mode and high-energy multi-peak mode. These are identified as a collective vibronic mode, and Flanck-Condon excitations in a single Jahn-Teller center modified by the inter-site interactions, respectively. Present formalism covers vibronic dynamics in several orbital-lattice coupled systems.

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Section: Introductionmentioning

confidence: 94%

Vibronic excitation dynamics in orbitally degenerate correlated electron system

Nasu

Ishihara

2013

Phys. Rev. B

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“…By rotating the polarization-analyzer crystal and the detector about the axis of the beam reflected by the energy-analyzer crystal by 90 , one can selectively measure horizontal or vertical components of the polarization. Ishii et al 57) used a flat pyrolytic graphite (PG) crystal for the Cu K-edge and found that the experimental reflectivity of the crystal was $0:02. This method is simple but the low reflectivity of the polarization-analysis crystal results in tremendously long accumulation times.…”

Section: Hard X-ray Regimementioning

confidence: 99%

“…176) On the other hand, the polarization analysis of hard x-rays was performed for the d-d excitations of KCuF 3 at the Cu Kedge. 57) From the polarization dependence, the excitation between the e g orbitals was successfully distinguished from the excitations from t 2g to e g . The polarization dependence of the respective excitations was interpreted on the basis of a phenomenological consideration of the symmetry of RIXS process that yields a necessary condition for observing the excitations.…”

Section: Technical Topicsmentioning

confidence: 99%

Inelastic X-ray Scattering Studies of Electronic Excitations

2013

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Inelastic x-ray scattering (IXS) has developed into one of the most powerful momentum-resolved spectroscopies. Especially in the last decade, it has achieved significant progress utilizing brilliant x-rays from third-generation synchrotron radiation facilities. Simultaneously, theoretical efforts have been made to predict or interpret the experimental spectra. One of the scientific fields studied intensively by IXS is strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties. IXS can provide a new insight into the electron dynamics of the systems through the observation of charge, spin, and orbital excitations. Focusing on the momentum-resolved electronic excitations in strongly correlated electron systems, we review IXS studies and the present capabilities of IXS for the study of the dynamics of materials. With nonresonant inelastic x-ray scattering (NIXS), one can directly obtain dynamical charge correlation and we discuss its complementary aspects with inelastic neutron scattering. NIXS also has a unique capability of measuring higher multipole transitions, which are usually forbidden in conventional optical absorption. Resonant inelastic x-ray scattering (RIXS) is now established as a valuable tool for measuring charge, spin, and orbital excitations in a momentum-resolved manner. We describe RIXS works on cuprates in detail and show what kind of electronic excitations have been observed. We also discuss RIXS studies on other transition-metal compounds. Finally, we conclude with an outlook on IXS using next-generation x-ray sources.

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“…A collective orbital excitation in an orbital ordered state is widely recognized as an orbital wave or its quantized object termed "orbiton", which is realized as an analogy of magonon in magnetically ordered system. The orbiton has been experimentally observed in LaMnO 3 and KCuF 3 by using the Raman scattering [2] and the resonant inelastic x-ray scattering (RIXS) technique [3,4]. As well as the experimental studies, theoretical studies have also been done to explore the characteristics of "orbiton" [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Orbital Dynamics Coupled with Jahn–Teller Phonons in Strongly Correlated Electron Systems

Nasu

Ishihara²

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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Orbital-lattice coupled excitations are examined in e g orbital degenerate systems such as LaMnO 3 and KCuF 3. Both the local vibronic excitations and the superexchange-type inter-site interactions are dealt with on an equal footing. We adopt the generalized spin-wave approximation where local vibronic states are fully taken into account. Orbital exitation spectra are examined as functions of the Jahn-Teller coupling and anharmonic potential of the lattice vibrations.

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Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF3

Cited by 26 publications

References 28 publications

Vibronic excitation dynamics in orbitally degenerate correlated electron system

Vibronic excitation dynamics in orbitally degenerate correlated electron system

Inelastic X-ray Scattering Studies of Electronic Excitations

Orbital Dynamics Coupled with Jahn–Teller Phonons in Strongly Correlated Electron Systems

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