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Journal Articles

Practical tests of neutron transmission imaging with a superconducting kinetic-inductance sensor

Vu, TheDang; Shishido, Hiroaki*; Aizawa, Kazuya; Kojima, Kenji M*; Koyama, Tomio*; Oikawa, Kenichi; Harada, Masahide; Oku, Takayuki; Soyama, Kazuhiko; Miyajima, Shigeyuki*; et al.

Nuclear Instruments and Methods in Physics Research A, 1006, p.165411_1 - 165411_8, 2021/08

 Times Cited Count:0 Percentile:0.02(Instruments & Instrumentation)

Journal Articles

$$s_{pm}$$-like spin resonance in the iron-based nodal superconductor BaFe$$_2$$(As$$_{0.65}$$P$$_{0.35}$$)$$_2$$ observed using inelastic neutron scattering

Ishikado, Motoyuki; Nagai, Yuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Wakimoto, Shuichi; Nakamura, Hiroki; Machida, Masahiko; Suzuki, Katsuhiro*; et al.

Physical Review B, 84(14), p.144517_1 - 144517_5, 2011/10

 Times Cited Count:26 Percentile:72.9(Materials Science, Multidisciplinary)

We performed inelastic neutron scattering on a powder sample of iron-based superconductor BaFe$$_2$$(As$$_{0.65}$$P$$_{0.35}$$)$$_2$$ with $$T_c$$ = 30 K. Although this system is expected to have line nodes in its superconducting order parameter, we have observed spin resonance at the same scattering vector as that appeared in the $$s_{pm}$$-wave iron-based superconductors without line nodes. Moreover, the resonance enhancement, which can be a measure of the area of sign reversal between the hole and electron Fermi surfaces (FSs), is comparable to those without line nodes. These facts indicate that the sign reversal between the FSs is still dominant in this system, and the line nodes should create only limited area of sign-reversal on a single FS. Hence the system can hold higher Tc than the other iron-based superconductors with nodal symmetry, such as LaFePO$$_{1-y}$$ and KFe$$_2$$As$$_2$$ ($$T_c <$$ 10 K).

Journal Articles

Spin excitations in iron oxypnictide superconductor system

Shamoto, Shinichi; Ishikado, Motoyuki; Wakimoto, Shuichi; Kodama, Katsuaki; Kajimoto, Ryoichi; Arai, Masatoshi; Fukuda, Tatsuo; Nakamura, Hiroki; Machida, Masahiko; Eisaki, Hiroshi*

Physica C, 470(Suppl.1), p.S284 - S287, 2010/12

 Times Cited Count:4 Percentile:22.98(Physics, Applied)

Journal Articles

Electron spectroscopy of doubly excited states in He produced by slow collisions of He$$^{2+}$$ ions with Ba atoms

Iemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Takeda, Junichi*; Machida, Shuichi*; Tanabe, K.*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; et al.

Physical Review A, 64(6), p.062709_1 - 062709_14, 2001/12

 Times Cited Count:6 Percentile:36.27(Optics)

We measured ejected electron spectra caused by autoionization of doubly excited states in He atoms; the excited He was made by double electron capture of low-energy He$$^{2+}$$ ions colliding with Ba atoms. Measurements were performed by means of zero degree electron spectroscopy at projectile energies from 40 to 20 keV. Electron spectra due to autoionization from the states He(2lnl) to He+(1s) for n$$geq$$2, and those from He(3lnl) to He$$^+$$(2s or 2p) for n$$geq$$3, were observed. Line peaks in the spectra were identified by comparing observed electron spectra with those of several theoretical calculations. It was found that doubly excited states of relatively high angular momenta such as the D and F terms were conspicuously created in a quite different manner from the cases of the production of doubly excited states by the use of photon, electron, or ion impacts on neutral He atoms. Rydberg states with large n values were observed with high population in both the He(2lnl) and He(3lnl) series.

Journal Articles

Double-electron excited singlet and triplet Be-like ions produced by slow He-like ion-atom collisions

Kitazawa, Shinichi; *; *; *; Machida, Shuichi*; *; Wakiya, K.*; *; F.Currel*; *; et al.

Atomic Collision Research in Japan, (24), p.70 - 72, 1998/00

no abstracts in English

Journal Articles

Electron spectra from singlet and triplet states of N$$^{3+}$$(1s$$^{2}$$3l3l',1s$$^{2}$$3l4l') produced by low energy N$$^{5+}$$+He, Ne and Ar collisions

Kitazawa, Shinichi; *; Machida, Shuichi*; Matsui, Y.*; Ida, H.*; *; Wakiya, K.*; *; F.Currell*; *; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 31(14), p.3233 - 3243, 1998/00

 Times Cited Count:9 Percentile:48.21(Optics)

no abstracts in English

Journal Articles

Ejected electron spectra from doubly-excited states 1s$$^{2}$$nln'l' of C$$^{2+}$$ ions produced by collisions of C$$^{4+}$$ ions with alkaline-earth atoms

Machida, Shuichi*; *; *; Wakiya, K.*; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*

Atomic Collision Research in Japan;Progress Report, (23), p.36 - 37, 1997/00

no abstracts in English

Journal Articles

Studies of ejected-electron spectra arising from O$$^{6+}$$-He, Ne, Ar and N$$^{5+}$$-He, Ne, Ar, collisions

Kitazawa, Shinichi; *; *; *; *; Sekiguchi, M.*; *; Wakiya, K.*; Machida, Shuichi*

Phys. Scr., T73, p.207 - 208, 1997/00

 Times Cited Count:1 Percentile:19.53(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Electron spectra from doubly-excited states 1s$$^{2}$$nln´l´ of Be-like ions produced by collisions of O$$^{6+}$$ and C$$^{4+}$$ ions with alkali earth atoms

Machida, Shuichi*; *; *; Wakiya, K.*; *; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*; et al.

Atomic Collision Research in Japan,No. 22, 0, p.49 - 50, 1996/00

no abstracts in English

Oral presentation

Inelastic neutron scattering on iron-based superconductors

Ishikado, Motoyuki; Nagai, Yuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Wakimoto, Shuichi; Nakamura, Hiroki; Machida, Masahiko; et al.

no journal, , 

Three years have passed since the discovery of iron-based superconductors, its maximum superconducting transition temperature ($$T_c$$) is 55 K, resulting in second highest material system next to cuprate high-$$T_c$$ superconductors. Among various material systems in iron-based superconductors, we have systematically studied on LaFeAsO$$_{1-x}$$F$$_x$$ ($$T_c^{max}$$=28 K) of first discovered system and BaFe$$_2$$(As,P)$$_2$$ which have recently attracted tremendous attention by the discovery of line nodes in its order parameter. In the session, we present recent results on "spin fluctuation and superconductivity on LaFePO$$_{0.9}$$", and "symmetry of order parameter on BaFe$$_2$$(As,P)$$_2$$ by inelastic neutron scattering" studied by the chopper spectrometer 4SEASONS (J-PARC).

Oral presentation

Resonant spin excitation on iron-based superconductor BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Nagai, Yuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Wakimoto, Shuichi; Nakamura, Hiroki; Machida, Masahiko; Suzuki, Katsuhiro*; et al.

no journal, , 

In this study, we have performed inelastic neutron scattering measurement on 36g powder sample of optimally-doped BaFe$$_2$$(As,P)$$_2$$ whose superconducting order parameter is expected to have line node by Fermi chopper spectrometer 4SEASONS in J-PARC. Unexpectedly, we have observed spin resonance at same $$Q$$-position and nearly identical resonance enhancement ration to other iron-based superconducctors with fully-gapped $$s_{+-}$$-wave. We will discuss about the possible superconducting gap symmetry based on our experimental results.

Oral presentation

Inelastic neutron scattering studies on iron-based high-$$T_c$$ superconductors

Ishikado, Motoyuki; Kodama, Katsuaki; Wakimoto, Shuichi; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Nagai, Yuki; Nakamura, Hiroki; Machida, Masahiko; et al.

no journal, , 

Among various iron-based superconductors, we have systematically studied on LaFeAsO$$_{1-x}$$F$$_x$$ ($$T_c^{max}$$=28 K) and BaFe$$_2$$(As,P)$$_2$$ ($$T_c^{max}$$=31 K) by the Fermi chopper spectrometer 4SEASONS (J-PARC). We will discuss the possible relation between high-$$T_c$$ superconductivity and magnetic fluctuation based on our inelastic neutron scattering results.

Oral presentation

Spin resonance on Fe-based superconductor BaFe$$_2$$(As,P)$$_2$$ with nodal gap symmetry

Ishikado, Motoyuki; Kodama, Katsuaki; Wakimoto, Shuichi; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Nagai, Yuki; Nakamura, Hiroki; Machida, Masahiko; Suzuki, Katsuhiro*; et al.

no journal, , 

In this study, we performed inelastic neutron scattering measurement on 36g polycrystalline powder sample of optimally-doped BaFe$$_2$$(As$$_{0.65}$$P$$_{0.35}$$)$$_2$$ using a Fermi chopper spectrometer 4SEASONS in J-PARC. We observed strong spin resonance at the same $$Q$$-position similar to those of other iron-based superconductors with fully-gapped $$s_{pm}$$-wave. We will discuss about the possible superconducting gap symmetry and what causes relatively high-$$T_{rm c}$$ of this material based on our inelastic neutron scattering results.

Oral presentation

Magnetic scattering on Fe-based superconductors La1111 and BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Nagai, Yuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Wakimoto, Shuichi; Nakamura, Hiroki; Machida, Masahiko; et al.

no journal, , 

We report systematic studies on Fe-based superconductors LaFeAsO$$_{1-x}$$F$$_x$$ ($$T^{max}_{rm c}$$ =28 K) and BaFe$$_2$$(As,P)$$_2$$ ($$T^{max}_{rm c}$$ =31 K) by using inelastic neutron scattering measurement.

Oral presentation

Spin resonance mode on Fe-based superconductor BaFe$$_2$$(As,P)$$_2$$ with $$T_{rm c}$$=30K

Ishikado, Motoyuki; Nagai, Yuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Wakimoto, Shuichi; Nakamura, Hiroki; Machida, Masahiko; Suzuki, Katsuhiro*; et al.

no journal, , 

In this study, we performed inelastic neutron scattering measurement on 36g polycrystalline powder sample of optimally-doped BaFe$$_2$$(As$$_{0.65}$$,P$$_{0.35}$$)$$_2$$ using Fermi chopper spectrometer 4SEASONS in J-PARC. Unexpectedly, we observed spin resonance at the same $$Q$$-position and nearly identical resonance enhancement ratio to other iron-based superconductors with fully-gapped $$s_{pm}$$-wave. We will discuss about the possible superconducting gap symmetry based on our inelastic neutron scattering experiment and theoretical calculations.

Oral presentation

Spin resonance on nodal iron-based high-TC superconductors

Ishikado, Motoyuki; Kodama, Katsuaki; Wakimoto, Shuichi; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Nagai, Yuki; Nakamura, Hiroki; Machida, Masahiko; et al.

no journal, , 

We have systematically studied nodal iron-based superconductor LaFePO$$_{0.9}$$ ($$T_{rm c}$$=5 K) and BaFe$$_2$$(As,P)$$_2$$ ($$T_{rm c}$$=30 K) by using Fermi chopper spectrometer 4SEASONS (J-PARC) and Triple Axis Spectrometer (TAS-1) at JRR-3. In the session, we will discuss the relation between superconductivity and spin fluctuation.

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