JOPSS - Search Results

Journal Articles

Local structure study of the iron-based systems of BaFeAs and LiFeAs by X-ray PDF and XAFS analyses

Li, S.*; Toyoda, Masayuki*; Kobayashi, Yoshiaki*; Ito, Masayuki*; Ikeuchi, Kazuhiko*; Yoneda, Yasuhiro; Otani, Akira*; Matsumura, Daiju; Asano, Shun*; Mizuki, Junichiro*; et al.

Physica C, 555, p.45 - 53, 2018/12

https://doi.org/10.1016/j.physc.2018.10.003

Times Cited Count：1 Percentile：4.99(Physics, Applied)

-dependence of local distortions in BaFeAs and LiFeAs by X-ray PDF and XAFS methods. Although PDF data exhibit anomaly at the structure transition temperature, EXAFS data exhibit no anomaly. Data supporting the local orthorhombicity at 300 K in the tetragonal phase for BaFeAs. Arguments on the origins of the 4-fold symmetry breaking in the ground average structure of the tetragonal phase.

Journal Articles

Resonant inelastic X-ray scattering study of entangled spin-orbital excitations in superconducting PrFeAsO $_{0.7}$

Nomura, Takuji*; Harada, Yoshihisa*; Niwa, Hideharu*; Ishii, Kenji*; Ishikado, Motoyuki*; Shamoto, Shinichi; Jarrige, I.*

Physical Review B, 94(3), p.035134_1 - 035134_9, 2016/07

https://doi.org/10.1103/PhysRevB.94.035134

Times Cited Count：11 Percentile：46.82(Materials Science, Multidisciplinary)

Low-energy electron excitation spectra were measured on a single crystal of a typical iron-based superconductor PrFeAsO $_{0.7}$ using resonant inelastic X-ray scattering (RIXS) at the Fe- $L_{3}$ edge.

Oral presentation

Spin orbital coupling observed on iron-based superconductors BaFeAs and PrFeAsO $_{1-delta}$

Shamoto, Shinichi; Fukuda, Tatsuo; Kodama, Katsuaki; Ishikado, Motoyuki*; Nakamura, Hiroki; Machida, Masahiko; Baron, A. Q. R.*

no journal, ,

Strong coupling between spin and orbital in iron-based superconductors will be discussed, based on our experimental results of phonon softening of PrFeAsO $_{1-delta}$ and anisotopic magnetic moment of BaFeAs.

Oral presentation

Inelastic neutron scattering study of iron-based superconductors FeSe $_{0.5}$ Te $_{0.5}$ and FeSe; Nematic effect of magnetic scattering spectra

Shamoto, Shinichi; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Matsuda, Yuji*; Shibauchi, Takasada*; Arai, Masatoshi*

no journal, ,

Iron-based superconductors FeSe $_{0.5}$ Te $_{0.5}$ and FeSe have been studied by inelastic neutron scattering measurement. In contrast of FeSe, FeSe $_{0.5}$ Te $_{0.5}$ exhibits temperature dependent incommensurability in magnetic spectrum with no clear structural transition. We find a jump in the incommensurability at about 70 K.

Oral presentation

Nematic effect on spin excitations of FeSe $_{0.5}$ Te $_{0.5}$ 5 and FeSe

Shamoto, Shinichi; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Shibauchi, Takasada*; Matsuda, Yuji*; Arai, Masatoshi*

no journal, ,

Iron-based superconductors FeSe $_{0.5}$ Te $_{0.5}$ and FeSe have been studied by inelastic neutron scattering measurement. Although FeSe $_{0.5}$ Te $_{0.5}$ does not exhibit any clear structural transition, the incommensurate magnetic excitation shows a jump at about 70 K in the incommensurability. It may suggest that the degeneracy of d $_{zx}$ and d $_{yz}$ orbitals in FeSe $_{0.5}$ Te $_{0.5}$ is lifted in this temperature range. It can be due to the nematic effect even in FeSe $_{0.5}$ Te $_{0.5}$ .

Oral presentation

Inelastic neutron scattering study of -FeSe

Shamoto, Shinichi; Mori, Michiyasu; Kajimoto, Ryoichi; Kodama, Katsuaki; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, ,

Iron-based superconductor -FeSe has not been studied in the high energy region by inelastic neutron scattering measurement. We have studied it with the single crystals grown by chemical vapor transport method. As a result, spin-wave like dispersion, which can be fitted by two types of anisotropic exchange interactions, is observed up to 200 meV.

Oral presentation

Spin nematic susceptibility studied by inelastic neutron scattering in FeSe

Shamoto, Shinichi; Kajimoto, Ryoichi; Ishikado, Motoyuki*; Yamakawa, Yoichi*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Kontani, Hiroshi*; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, ,

no abstracts in English

Oral presentation

Neutron-scattering study of the dynamical spin susceptibility in FeSe

Shamoto, Shinichi

no journal, ,

A simple superconductor, FeSe, attracts much attention due to the nematic fluctuation as the possible origin of superconductivity. Recent results obtained by inelastic neutron scattering are presented.

Oral presentation

Large downward renormalization of spin excitation energies in Ba $_{0.75}$ K $_{0.25}$ Fe $_{2}$ As $_{2}$ due to electron correlation effects

Murai, Naoki; Kajimoto, Ryoichi; Suzuki, Katsuhiro*; Ideta, Shinichiro*; Nakajima, Masamichi*; Ikeda, Hiroaki*; Tanaka, Kiyohisa*

no journal, ,

Using inelastic neutron scattering (INS) and angle-resolved photoemission spectroscopy (ARPES), we investigate the spin dynamics of iron-based superconductor Ba $_{0.75}$ K $_{0.25}$ Fe $_{2}$ As $_{2}$ . The INS data show a spin-wave-like dispersive feature, with a zone boundary energy of 200 meV. A random phase approximation (RPA) treatment of the dynamical spin susceptibility, incorporating the band renormalization factor of 3 derived from the ARPES measurements on the same crystals, provides a reasonable description of the observed spin excitations. This analysis shows that the experimental spin excitation peak lies at a much lower energy than the bare value, reflecting a strong renormalization of the quasiparticle band dispersion near the Fermi level due to electron correlation effect. The present results point to a unified framework that connects the magnetic response to the underlying electronic structure of the materials.

Oral presentation

FeSe superconductor from bulk to single unit-cell

Shamoto, Shinichi; Fukaya, Yuki

no journal, ,

FeSe has one of the simplest crystal structure among many iron-based superconductors. In addition, high-Tc above 60 K has been reported in a single unit-cell FeSe. Because the pairing mechanism is still one of the central issues in Fe-based superconductors, FeSe is an idealistic compound to study the mechanism. Our experimental results of FeSe will be reported.

Oral presentation

Nematicity of iron-based superconductor by neutron scattering

Shamoto, Shinichi

no journal, ,

no abstracts in English

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Local structure study of the iron-based systems of BaFeAs and LiFeAs by X-ray PDF and XAFS analyses

Resonant inelastic X-ray scattering study of entangled spin-orbital excitations in superconducting PrFeAsO $_{0.7}$

Spin orbital coupling observed on iron-based superconductors BaFeAs and PrFeAsO $_{1-delta}$

Inelastic neutron scattering study of iron-based superconductors FeSe $_{0.5}$ Te $_{0.5}$ and FeSe; Nematic effect of magnetic scattering spectra

Nematic effect on spin excitations of FeSe $_{0.5}$ Te $_{0.5}$ 5 and FeSe

Inelastic neutron scattering study of -FeSe

Spin nematic susceptibility studied by inelastic neutron scattering in FeSe

Neutron-scattering study of the dynamical spin susceptibility in FeSe

Large downward renormalization of spin excitation energies in Ba $_{0.75}$ K $_{0.25}$ Fe $_{2}$ As $_{2}$ due to electron correlation effects

FeSe superconductor from bulk to single unit-cell

Nematicity of iron-based superconductor by neutron scattering