JOPSS - Search Results

Journal Articles

Momentum dependence of Mott gap excitations in optimally doped YBaCuO $_{7-delta}$ studied by resonant inelastic X-ray scattering

Ishii, Kenji; Tsutsui, Kenji*; Endo, Yasuo*; Toyama, Takami*; Kuzushita, Kaori; Inami, Toshiya; Owada, Kenji; Maekawa, Sadamichi*; Masui, Takahiko*; Tajima, Setsuko*; et al.

AIP Conference Proceedings 850, p.445 - 446, 2006/09

https://doi.org/10.1063/1.2354776

Mott gap excitations in the optimally doped high- $T_{c}$ superconductor YBaCuO $_{7-delta}$ ( $T_{c}$ = 93 K) have been studied by the resonant inelastic X-ray scattering method. Anisotropic spectra in the -plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the $b^{*}$ direction, while the excitation from the CuO plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculation based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra when different values of the on-site Coulomb energy are assumed. The Mott gap of the CuO chain site is found to be much smaller than that of the CuO plane site.

Journal Articles

Doping Momentum dependence of charge dynamics in Nd $_{2-x}$ Ce $_{x}$ CuO (x=0, 0.075, and 0.15) studied by Resonant inelastic X-ray scattering

Ishii, Kenji; Tsutsui, Kenji*; Endo, Yasuo*; Toyama, Takami*; Maekawa, Sadamichi*; Hoesch, M.; Kuzushita, Kaori; Inami, Toshiya; Tsubota, Masami; Yamada, Kazuyoshi*; et al.

AIP Conference Proceedings 850, p.403 - 404, 2006/09

https://doi.org/10.1063/1.2354756

We report a resonant inelastic X-ray scattering (RIXS) study of charge excitations in the electron-doped high- $T_{c}$ superconductor Nd $_{1.85}$ Ce $_{0.15}$ CuO. The intraband and interband excitations across the Fermi energy are separated for the first time by tuning the experimental conditions properly to measure charge excitations at low energy. A dispersion relation with -dependent width emerges clearly in the intraband excitation, while the intensity of the interband excitation is concentrated around 2 eV near the zone center. The experimental results are consistent with theoretical calculation of the RIXS spectra based on the Hubbard model.

Journal Articles

Momentum dependence of charge excitations in the electron-doped superconductor Nd $_{1.85}$ Ce $_{0.15}$ CuO; A Resonant inelastic X-ray scattering study

Ishii, Kenji; Tsutsui, Kenji*; Endo, Yasuo*; Toyama, Takami*; Maekawa, Sadamichi*; Hoesch, M.; Kuzushita, Kaori; Tsubota, Masami; Inami, Toshiya; Mizuki, Junichiro; et al.

Physical Review Letters, 94(20), p.207003_1 - 207003_4, 2005/05

https://doi.org/10.1103/PhysRevLett.94.207003

Times Cited Count：72 Percentile：89.18(Physics, Multidisciplinary)

We report a resonant inelastic X-ray scattering (RIXS) study of charge excitations in the electron-doped high- $T_{c}$ superconductor Nd $_{1.85}$ Ce $_{0.15}$ CuO. The intraband and interband excitations across the Fermi energy are separated for the first time by tuning the experimental conditions properly to measure charge excitations at low energy. A dispersion relation with -dependent width emerges clearly in the intraband excitation, while the intensity of the interband excitation is concentrated around 2 eV near the zone center. The experimental results are consistent with theoretical calculation of the RIXS spectra based on the Hubbard model.

Journal Articles

Mott gap excitations in twin-free YBaCuO $_{7-delta}$ ( $T_{c}$ = 93 K) studied by resonant inelastic X-ray scattering

Ishii, Kenji; Tsutsui, Kenji*; Endo, Yasuo*; Toyama, Takami*; Kuzushita, Kaori; Inami, Toshiya; Owada, Kenji; Maekawa, Sadamichi*; Masui, Takahiko*; Tajima, Setsuko*; et al.

Physical Review Letters, 94(18), p.187002_1 - 187002_4, 2005/05

https://doi.org/10.1103/PhysRevLett.94.187002

Times Cited Count：40 Percentile：80.87(Physics, Multidisciplinary)

Mott gap excitations in the optimally doped high- $T_{c}$ superconductor YBaCuO $_{7-delta}$ ( $T_{c}$ = 93 K) have been studied by the resonant inelastic X-ray scattering method. Anisotropic spectra in the -plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the $b^{*}$ direction, while the excitation from the CuO plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculation based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra when different values of the on-site Coulomb energy are assumed. The Mott gap of the CuO chain site is found to be much smaller than that of the CuO plane site.

Journal Articles

Doping dependence of softening in the bond-stretching phonon mode of La $_{2-x}$ SrCuO (00.29)

Fukuda, Tatsuo; Mizuki, Junichiro; Ikeuchi, Kazuhiko*; Yamada, Kazuyoshi*; Baron, A. Q. R.*; Tsutsui, Satoshi*

Physical Review B, 71(6), p.060501_1 - 060501_4, 2005/02

https://doi.org/10.1103/PhysRevB.71.060501

Times Cited Count：58 Percentile：86.2(Materials Science, Multidisciplinary)

Phonons along the [100] direction, in particular the highest energy Cu-O bond-stretching LO mode, of La $_{2-x}$ SrCuO have been studied by inelastic X-ray scattering experiments. The LO phonon mode in the = 0.12 sample shows significant softening similar to early neutron studies. We show here a recovery of the softening was found in the = 0.29 sample, where superconductivity degrades and normal metallic conductivity dominates. The results suggest one-to-one correspondence between the softening of this LO phonon and the superconductivity.

Journal Articles

Irradiation effects on MgB $_{2}$ bulk samples and formation of columner defects on high-Tc supercoductor

Okayasu, Satoru; Sasase, Masato; Hojo, Kiichi; Chimi, Yasuhiro; Iwase, Akihiro; Ikeda, Hiroshi*; Yoshizaki, Ryozo*; Kambara, Tadashi*; Sato, H.*; Hamatani, Yutaro*; et al.

Physica C, 382(1), p.104 - 107, 2002/10

https://doi.org/10.1016/S0921-4534(02)01206-6

Times Cited Count：28 Percentile：75.35(Physics, Applied)

no abstracts in English

Journal Articles

Plasma behavior confined on high-Tc superconducting tube

Yamauchi, Toshihiko; Matsuzawa, Hidenori*; Mikami, Koji*; Ishikawa, Junichi*

Proceedings of International Conference on Phenomena in Ionized Gases (25th ICPIG), p.295 - 296, 2001/00

no abstracts in English

Journal Articles

Lattice relaxation process in GeV ion irradiated materials

Iwase, Akihiro

Dai-11-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS 2000) Hobunshu, p.123 - 126, 2000/00

no abstracts in English

Journal Articles

Magnetocaloric effects in YBa $_{2}$ Cu $_{3}$ O $_{7-delta}$ ; Evidence for a surface barrier

Watanabe, Mitsuo; Iwata, Tadao

Physical Review Letters, 72(21), p.3429 - 3432, 1994/05

https://doi.org/10.1103/PhysRevLett.72.3429

Times Cited Count：4 Percentile：44.18(Physics, Multidisciplinary)

no abstracts in English

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Momentum dependence of Mott gap excitations in optimally doped YBaCuO $_{7-delta}$ studied by resonant inelastic X-ray scattering

Doping Momentum dependence of charge dynamics in Nd $_{2-x}$ Ce $_{x}$ CuO (x=0, 0.075, and 0.15) studied by Resonant inelastic X-ray scattering

Momentum dependence of charge excitations in the electron-doped superconductor Nd $_{1.85}$ Ce $_{0.15}$ CuO; A Resonant inelastic X-ray scattering study

Mott gap excitations in twin-free YBaCuO $_{7-delta}$ ( $T_{c}$ = 93 K) studied by resonant inelastic X-ray scattering

Doping dependence of softening in the bond-stretching phonon mode of La $_{2-x}$ SrCuO (00.29)

Irradiation effects on MgB $_{2}$ bulk samples and formation of columner defects on high-Tc supercoductor

Plasma behavior confined on high-Tc superconducting tube

Lattice relaxation process in GeV ion irradiated materials

Magnetocaloric effects in YBa $_{2}$ Cu $_{3}$ O $_{7-delta}$ ; Evidence for a surface barrier