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Journal Articles

Q dependence of magnetic resonance mode on FeTe$$_{0.5}$$Se$$_{0.5}$$ studied by inelastic neutron scattering

Ishikado, Motoyuki*; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Ikeuchi, Kazuhiko*; Ji, S.*; Arai, Masatoshi*; Shamoto, Shinichi

Condensed Matter (Internet), 4(3), p.69_1 - 69_10, 2019/09

https://doi.org/10.3390/condmat4030069

The enhancement magnetic resonance mode of FeTe$$_{0.5}$$Se$$_{0.5}$$ is limited around Q = ($$pi$$, 0). Q dependence is found to be consistent with a theoretical simulation of the magnetic resonance mode with the sign-reversing order parameter of s$$pm$$wave.

Journal Articles

Inelastic neutron scattering on iron-based superconductor BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Wakimoto, Shuichi; Iyo, Akira*; Eisaki, Hiroshi*; Arai, Masatoshi; Shamoto, Shinichi

Physica C, 471(21-22), p.643 - 646, 2011/11

https://doi.org/10.1016/j.physc.2011.05.016
 Times Cited Count：4 Percentile：20.88(Physics, Applied)

Superconducting gap symmetry of $$Ln$$1111 system, which has the highest $$T_c$$ in iron-based superconductors, is considered to be full gap $$s_{pm}$$ wave based on magnetic penetration depth and neutron scattering measurements. On the other hand, a line node gap symmetry is proposed in BaFe$$_2$$(As,P)$$_2$$ based on magnetic penetration depth and thermal conductivity measurements despite comparatively its high-$$T_c$$ ($$T_c$$=30 K). Inelastic neutron scattering of BaFe$$_2$$(As,P)$$_2$$ may exhibit different magnetic excitations in the $$Q$$-position or $$E$$-dependence of a resonant peak from that of La1111 system. In this study, we performed inelastic neutron scattering measurement on 36g polycrystalline powder sample of optimally-doped BaFe$$_2$$(As,P)$$_2$$ using Fermi chopper spectrometer 4SEASONS in J-PARC. We will discuss about the possible superconducting gap symmetry based on our inelastic neutron scattering results.

Journal Articles

Structural analysis on iron-based superconductor Pr1111 system with oxygen deficiency and flourine substitution

Kodama, Katsuaki; Ishikado, Motoyuki; Esaka, Fumitaka; Iyo, Akira*; Eisaki, Hiroshi*; Shamoto, Shinichi

Journal of the Physical Society of Japan, 80(3), p.034601_1 - 034601_6, 2011/03

https://doi.org/10.1143/JPSJ.80.034601
 Times Cited Count：12 Percentile：60.48(Physics, Multidisciplinary)

Journal Articles

High-pressure synthesis and physical properties of new iron (nickel)-based superconductors

Shirage, P. M.*; Miyazawa, Kiichi*; Ishikado, Motoyuki; Kiho, Kunihiro*; Lee, C.-H.*; Takeshita, Nao*; Matsuhata, Hirofumi*; Kumai, Reiji*; Tomioka, Yasuhide*; Ito, Toshimitsu*; et al.

Physica C, 469(9-12), p.355 - 369, 2009/06

https://doi.org/10.1016/j.physc.2009.03.027
 Times Cited Count：40 Percentile：79.94(Physics, Applied)

We have utilized a high-pressure (HP) technique to synthesize a series of newly-discovered iron (nickel)-based superconductors. The effect of (O)-deficiency, variation of $$Ln$$ ions, and the external pressure on $$T$$$$_{rm c}$$ are examined. All the experimental data indicate strong correlation between the crystal structure and the superconductivity of the oxypnictide superconductors. Upper critical field measurement on single crystalline sample of PrFeAsO$$_{1-y}$$ shows the superconducting anisotropy of 5, which is smaller than cuprates. We also demonstrate that HP technique is applicable for the so-called "122" systems.

Journal Articles

Two-dimensional spin density wave state in LaFeAsO

Ishikado, Motoyuki; Kajimoto, Ryoichi; Shamoto, Shinichi; Arai, Masatoshi; Iyo, Akira*; Miyazawa, Kiichi*; Shirage, P. M.*; Kito, Hijiri*; Eisaki, Hiroshi*; Kim, S.-W.*; et al.

Journal of the Physical Society of Japan, 78(4), p.043705_1 - 043705_4, 2009/04

https://doi.org/10.1143/JPSJ.78.043705
 Times Cited Count：34 Percentile：80.55(Physics, Multidisciplinary)

Oral presentation

Magnetic excitation spectrum in LaFeAsO$$_{1-x}$$F$$_{x}$$ system

Shamoto, Shinichi; Wakimoto, Shuichi; Ishikado, Motoyuki; Kodama, Katsuaki; Kajimoto, Ryoichi; Arai, Masatoshi; Matsuda, Masaaki; Kakurai, Kazuhisa; Esaka, Fumitaka; Iyo, Akira*; et al.

no journal, , 

Oral presentation

Growth of single crystal PrFeAsO$$_{1-y}$$ and its transport properties

Ishikado, Motoyuki; Shamoto, Shinichi; Kito, Hijiri*; Iyo, Akira*; Eisaki, Hiroshi*; Ito, Toshimitsu*; Tomioka, Yasuhide*

no journal, , 

Single crystals of oxygen deficient oxypnictide superconductor PrFeAsO$$_{1-y}$$ were grown by high pressure method using belt-type anvil apparatus. Grown crystals have shiny ab-plane surfaces. Typical crystal size is about 800$$times$$1000$$times$$20 mm$$^3$$, which is one order larger than the previous reported LnFeAs(O,F) single crystal size. Upper critical field obtained from resistivity measurement under magnetic field yields anisotropy of $$Gammasim$$5, which is consistent with other group's reported result. In the session, we will talk details of the method of doping control of the single crystal and doping dependences of anisotropy.

Oral presentation

Inelastic neutron scattering on iron-based superconductor BaFe$$_2$$(As,P)$$_2$$

Ishikado, Motoyuki; Kodama, Katsuaki; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Inamura, Yasuhiro; Wakimoto, Shuichi; Arai, Masatoshi; Iyo, Akira*; Eisaki, Hiroshi*; Shamoto, Shinichi

no journal, , 

Superconducting gap symmetry of $$Ln$$1111 system, which has the highest $$T$$$$_{rm c}$$ in iron-based superconductors, is considered to be full gap $$s_{pm}$$-wave based on magnetic penetration depth and neutron scattering measurements. On the other hand, a line node gap symmetry is proposed in BaFe$$_2$$(As,P)$$_2$$ based on magnetic penetration depth and thermal conductivity measurements despite comparatively its high-$$T$$$$_{rm c}$$ (= 30K). Therefore, inelastic neutron scattering of BaFe$$_2$$(As,P)$$_2$$ may exhibit different magnetic excitations in the $$Q$$-position or $$E$$-dependence of a resonant peak from that of La1111 system. In this study, we performed inelastic neutron scattering measurement on 36g polycrystalline powder sample of optimally-doped BaFe$$_2$$(As,P)$$_2$$ using Fermi chopper spectrometer 4SEASONS in J-PARC. We will discuss about the possible superconducting gap symmetry based on our inelastic neutron scattering results.

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

Iron-based superconductors observed by neutron scattering

Shamoto, Shinichi; Ishikado, Motoyuki; Kodama, Katsuaki

no journal, , 

no abstracts in English

Oral presentation

Comparison of iron-based superconductors with cuprates in terms of phase diagram

Shamoto, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Inelastic neutron scattering study of low-energy spin excitations on LaFeAsO$$_{1-x}$$F$$_{x}$$ system

Shamoto, Shinichi; Ishikado, Motoyuki*; Wakimoto, Shuichi; Kodama, Katsuaki; Kajimoto, Ryoichi*; Arai, Masatoshi

no journal, , 

Low-energy spin excitations on polycrystalline LaFeAsO$$_{1-x}$$F$$_{x}$$ samples have been studied by inelastic neutron scattering. The dynamical spin susceptibility $$chi$$"($$omega$$) of the superconducting (SC) samples is found to be comparable to that of the magnetically ordered parent sample. On the other hand, $$chi$$"($$omega$$) almost vanishes at x=0.158, where the SC transition temperature T$$_{c}$$ is suppressed to 7 K. This result suggests that the low energy spin excitations are closely connected with high-T$$_{c}$$ superconductivity.

Oral presentation

Report of quantum beam JST-TRIP

Shamoto, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Superconducting gap structure of optimally doped LaFeAsO$$_{1-y}$$ by penetration depth measurement

Mizukami, Yuta*; Kawamoto, Yuta*; Goh, S. K.*; Ishikado, Motoyuki*; Ishida, Shigeyuki*; Kito, Hijiri*; Iyo, Akira*; Eisaki, Hiroshi*; Shamoto, Shinichi; Shibauchi, Takasada*; et al.

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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