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Journal Articles

Quantum paramagnet near spin-state transition

Tomiyasu, Keisuke*; Ito, Naoko*; Okazaki, Ryuji*; Takahashi, Yuki*; Onodera, Mitsugi*; Iwasa, Kazuaki*; Nojima, Tsutomu*; Aoyama, Takuya*; Ogushi, Kenya*; Ishikawa, Yoshihisa*; et al.

Advanced Quantum Technologies (Internet), 1(3), p.1800057_1 - 1800057_7, 2018/12

Spin-state transition, also known as spin crossover, plays a key role in diverse systems. In theory, the boundary range between the low- and high-spin states is expected to enrich the transition and give rise to unusual physical states. However, no compound that realizes a nearly degenerate critical range as the ground state without requiring special external conditions has yet been experimentally identified. This study reports that the Sc substitution in LaCoO3 destabilizes its nonmagnetic low-spin state and generates an anomalous paramagnetic state accompanied by the enhancement of transport gap and magneto-lattice-expansion as well as the contraction of Co-O distance with the increase of electron site transfer. These phenomena are not well described by the mixture of conventional low- and high-spin states, but by their quantum superposition occurring on the verge of a spin-state transition.

Journal Articles

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

Yoshida, Masahiro*; Ishii, Kenji; Naka, Makoto*; Ishihara, Sumio*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Kudo, Kazutaka*; Koike, Yoji*; Nagata, Tomoko*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

 Times Cited Count:1 Percentile:11.55(Multidisciplinary Sciences)

Journal Articles

Polarization-analyzed resonant inelastic X-ray scattering of the orbital excitations in KCuF$$_3$$

Ishii, Kenji; Ishihara, Sumio*; Murakami, Yoichi*; Ikeuchi, Kazuhiko*; Kuzushita, Kaori*; Inami, Toshiya; Owada, Kenji; Yoshida, Masahiro; Jarrige, I.; Tatami, Naka*; et al.

Physical Review B, 83(24), p.241101_1 - 241101_4, 2011/06

 Times Cited Count:21 Percentile:64.51(Materials Science, Multidisciplinary)

Journal Articles

Electronic excitations in hole-doped La$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$ studied by resonant inelastic X-ray scattering

Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.

Journal of Physics and Chemistry of Solids, 66(12), p.2157 - 2162, 2005/12

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

We have studied electronic excitations of hole-doped manganese oxides La$$_{1-x}$$Sr$$_x$$MnO$$_3$$ ($$x=0.2$$ and $$0.4$$) by resonant inelastic X-ray scattering at Mn K absorption edge. We observed in the excitation spectra that the Mott gap of La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_{3}$$ was filled by hole-doping. In La$$_{0.8}$$Sr$$_{0.2}$$MnO$$_{3}$$, which shows a metal-insulator transition, we found that temperature dependence of scattering intensity is different between two scattering vectors. It may reflects a anisotropic electronic structure which originates from the orbital degrees of freedom in manganese oxides.

Journal Articles

Resonant inelastic X-ray scattering study of the hole-doped manganites La$$_{1-x}$$Sr$$_x$$MnO$$_3$$ ($$x=0.2$$, $$0.4$$)

Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.

Physical Review B, 70(22), p.224437_1 - 224437_6, 2004/12

 Times Cited Count:19 Percentile:64.39(Materials Science, Multidisciplinary)

Electronic excitations in the hole doped manganese oxides (La$$_{1-x}$$Sr$$_x$$MnO$$_3$$, $$x=0.2$$ and $$0.4$$) have been elucidated by using the resonant inelastic X-ray scattering (RIXS) method. A doping effect in the strongly correlated electron systems has been observed for the first time. The scattering spectra show that a salient peak appears in low energies indicating the persistence of the Mott gap. At the same time, the energy gap is partly filled by doping holes and the spectral weight energy shifts toward lower energies. The excitation spectra show little change in the momentum space as is in undoped LaMnO$$_3$$. On the other hand, the scattering intensities in the low energy excitations of $$x=0.2$$ are anisotropic in temperature dependence, which indicates an anisotropy of magnetic interaction and underlying effect of the orbital.

Journal Articles

Orbital excitations in LaMnO$$_3$$ studied by resonant inelastic X-ray scattering

Inami, Toshiya; Fukuda, Tatsuo; Mizuki, Junichiro; Ishihara, Sumio*; Kondo, Hiroshi*; Nakao, Hironori*; Matsumura, Takeshi*; Hirota, Kazuma*; Murakami, Yoichi*; Maekawa, Sadamichi*; et al.

Physical Review B, 67(4), p.045108_1 - 045108_6, 2003/01

 Times Cited Count:56 Percentile:88(Materials Science, Multidisciplinary)

We report resonant inelastic x-ray scattering experiments of the orbitally ordered manganite LaMnO$$_3$$. When incident photon energy is tuned near the Mn $$K$$ absorption edge, the spectra reveal three features at 2.5 eV, 8 eV and 11 eV. The 8 eV and 11 eV peaks are ascribed to transitions from the O 2$$p$$ bands to the empty Mn 3$$d$$ and $$4s$$/$$4p$$ bands, respectively. On the other hand, the 2.5 eV peak is considered an orbital excitation across the Mott gap, ${it i.e.}$ an electron excitation from the effective lower Hubbard band with the $$d_{3x^2-r^2}$$ and $$d_{3y^2-r^2}$$ orbital characters to the upper Hubbard band with the $$d_{y^2-z^2}$$ and $$d_{z^2-x^2}$$ ones. The weak dispersion and characteristic azimuthal angle dependence of this excitation are well reproduced by a theory which includes orbital degeneracy and strong electron correlation.

Oral presentation

Polarization dependence in RIXS of La$$_{1-x}$$Sr$$_x$$MnO$$_3$$

Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori*; Mizuki, Junichiro; Murakami, Yoichi*; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.

no journal, , 

no abstracts in English

Oral presentation

Polarization dependence of dd excitations in resonant inelastic X-ray scattering

Ishii, Kenji; Yoshida, Masahiro; Jarrige, I.; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Mizuki, Junichiro; Ishihara, Sumio*

no journal, , 

no abstracts in English

Oral presentation

Polarization-analyzed RIXS for orbital excitation in KCuF$$_3$$

Ishii, Kenji; Ishihara, Sumio*; Murakami, Yoichi*; Ikeuchi, Kazuhiko*; Kuzushita, Kaori*; Owada, Kenji; Inami, Toshiya; Yoshida, Masahiro; Jarrige, I.; Tatami, Naka*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic excitations by resonant inelastic X-ray scattering

Ishii, Kenji; Yoshida, Masahiro; Jarrige, I.; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Mizuki, Junichiro; Ishihara, Sumio*; Tsutsui, Kenji; Toyama, Takami*; Maekawa, Sadamichi; et al.

no journal, , 

Oral presentation

Fluctuation of frustrated charge in LuFe$$_2$$O$$_4$$ observed by resonant inelastic X-ray scattering

Ishii, Kenji; Yoshida, Masahiro; Jarrige, I.; Mizuki, Junichiro; Naka, Makoto*; Ishihara, Sumio*; Ikeda, Naoshi*

no journal, , 

no abstracts in English

11 (Records 1-11 displayed on this page)
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