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Journal Articles

Magnetism induced by interlayer electrons in the quasi-two-dimensional electride Y$$_{2}$$C; Inelastic neutron scattering study

Tamatsukuri, Hiromu; Murakami, Yoichi*; Kuramoto, Yoshio*; Sagayama, Hajime*; Matsuura, Masato*; Kawakita, Yukinobu; Matsuishi, Satoru*; Washio, Yasuhito*; Inoshita, Takeshi*; Hamada, Noriaki*; et al.

Physical Review B, 102(22), p.224406_1 - 224406_5, 2020/12

 Times Cited Count:3 Percentile:58.93(Materials Science, Multidisciplinary)

Journal Articles

Quantum dynamics of hydrogen in the iron-based superconductor LaFeAsO$$_{0.9}$$D$$_{0.1}$$ measured with inelastic neutron spectroscopy

Yamaura, Junichi*; Hiraka, Haruhiro*; Iimura, Soshi*; Muraba, Yoshinori*; Bang, J.*; Ikeuchi, Kazuhiko*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Honda, Takashi*; Hiraishi, Masatoshi*; et al.

Physical Review B, 99(22), p.220505_1 - 220505_6, 2019/06

AA2019-0126.pdf:0.9MB

 Times Cited Count:1 Percentile:10.83(Materials Science, Multidisciplinary)

Inelastic neutron scattering was performed for an iron-based superconductor, where most of D (deuterium) replaces oxygen, while a tiny amount goes into interstitial sites. By first-principle calculation, we characterize the interstitial sites for D (and for H slightly mixed) with four equivalent potential minima. Below the superconducting transition temperature Tc = 26 K, new excitations emerge in the range 5-15 meV, while they are absent in the reference system LaFeAsO$$_{0.9}$$F$$_{0.1}$$. The strong excitations at 14.5 meV and 11.1 meV broaden rapidly around 15 K and 20 K, respectively, where each energy becomes comparable to twice of the superconducting gap. The strong excitations are ascribed to a quantum rattling, or a band motion of hydrogen, which arises only if the number of potential minima is larger than two.

Journal Articles

Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO$$_{0.5}$$D$$_{0.5}$$

Tamatsukuri, Hiromu*; Hiraka, Haruhiro*; Ikeuchi, Kazuhiko*; Iimura, Soshi*; Muraba, Yoshinori*; Nakamura, Mitsutaka; Sagayama, Hajime*; Yamaura, Junichi*; Murakami, Yoichi*; Kuramoto, Yoshio*; et al.

Physical Review B, 98(17), p.174415_1 - 174415_6, 2018/11

AA2018-0436.pdf:0.85MB

 Times Cited Count:2 Percentile:16.65(Materials Science, Multidisciplinary)

Magnetic excitations in a heavily electron-doped antiferromagnet, LaFeAsO$$_{0.5}$$D$$_{0.5}$$, have been investigated using powder inelastic neutron scattering. Unlike other parent compounds of the iron-based superconductors, the magnetic excitation gap in LaFeAsO$$_{0.5}$$D$$_{0.5}$$ was not detected down to the lowest measured temperature of 4 K. This result can be understood as a result of quasi-isotropy within the ab plane, which is consistent with the band calculation result that the $$d_{xy}$$ orbital plays the dominant role in the magnetism of LaFeAsO$$_{0.5}$$H$$_{0.5}$$. In addition, the intensities of the magnetic excitations in this phase are much stronger than those in nondoped LaFeAsO. Even in the paramagnetic phase, the magnetic excitation in LaFeAsO$$_{0.5}$$D$$_{0.5}$$ persists. These results corroborate recent studies showing that the electron doping enhances the localized nature in this system.

Journal Articles

Bipartite magnetic parent phases in the iron oxypnictide superconductor

Hiraishi, Masatoshi*; Iimura, Soshi*; Kojima, Kenji*; Yamaura, Junichi*; Hiraka, Haruhiro*; Ikeda, Kazutaka*; Miao, P.*; Ishikawa, Yoshihisa*; Torii, Shuki*; Miyazaki, Masanori*; et al.

Nature Physics, 10(4), p.300 - 303, 2014/04

 Times Cited Count:94 Percentile:96.38(Physics, Multidisciplinary)

Journal Articles

Magnetic structure and electromagnetic properties of LnCrAsO with a ZrCuSiAs-type structure (Ln = La, Ce, Pr, and Nd)

Park, S.-W.*; Mizoguchi, Hiroshi*; Kodama, Katsuaki; Shamoto, Shinichi; Otomo, Toshiya*; Matsuishi, Satoru*; Kamiya, Toshio*; Hosono, Hideo*

Inorganic Chemistry, 52(23), p.13363 - 13368, 2013/12

 Times Cited Count:20 Percentile:73.1(Chemistry, Inorganic & Nuclear)

Journal Articles

Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors

Iimura, Soshi*; Matsuishi, Satoru*; Miyakawa, Masashi*; Taniguchi, Takashi*; Suzuki, Katsuhiro*; Usui, Hidetomo*; Kuroki, Kazuhiko*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; et al.

Physical Review B, 88(6), p.060501_1 - 060501_5, 2013/08

 Times Cited Count:26 Percentile:76.11(Materials Science, Multidisciplinary)

Journal Articles

From antiferromagnetic insulator to ferromagnetic metal; Effect of hydrogen substitution in LaMnAsO

Hanna, Taku*; Matsuishi, Satoru*; Kodama, Katsuaki; Otomo, Toshiya*; Shamoto, Shinichi; Hosono, Hideo*

Physical Review B, 87(2), p.020401_1 - 020401_5, 2013/01

 Times Cited Count:29 Percentile:78.97(Materials Science, Multidisciplinary)

Journal Articles

Structural analysis and superconductivity of CeFeAsO$$_{1-x}$$H$$_{x}$$

Matsuishi, Satoru*; Hanna, Taku*; Muraba, Yoshinori*; Kim, S. W.*; Kim, J. E.*; Takata, Masaki*; Shamoto, Shinichi; Smith, R. I.*; Hosono, Hideo*

Physical Review B, 85(1), p.014514_1 - 014514_6, 2012/01

 Times Cited Count:41 Percentile:85.51(Materials Science, Multidisciplinary)

We performed the neutron powder diffraction and synchrotron X-ray diffraction measurements on CeFeAsO$$_{1-x}$$(D,H)$$_{x}$$ ($$x$$ = 0.0-0.48) as a representative of 1111-type family of iron-based superconductors LnFeAsO$$_{1-x}$$H$$_{x}$$ ($$Ln$$ = lanthanoid). These results strongly suggest that H$$^{-}$$ ions exclusively occupy the oxygen sites in both samples, regardless of the hydrogen species in the starting material.

Journal Articles

Hydrogen in layered iron arsenides; Indirect electron doping to induce superconductivity

Hanna, Taku*; Muraba, Yoshinori*; Matsuishi, Satoru*; Igawa, Naoki; Kodama, Katsuaki; Shamoto, Shinichi; Hosono, Hideo*

Physical Review B, 84(2), p.024521_1 - 024521_7, 2011/07

 Times Cited Count:91 Percentile:94.9(Materials Science, Multidisciplinary)

Journal Articles

Crystal and magnetic structures of the superconductor CeNi$$_{0.8}$$Bi$$_2$$

Kodama, Katsuaki; Wakimoto, Shuichi; Igawa, Naoki; Shamoto, Shinichi; Mizoguchi, Hiroshi*; Hosono, Hideo*

Physical Review B, 83(21), p.214512_1 - 214512_5, 2011/06

 Times Cited Count:18 Percentile:63.38(Materials Science, Multidisciplinary)

Journal Articles

Antiferromagnetic bipolar semiconductor LaMnPO with ZrCuSiAs-type structure

Yanagi, Hiroshi*; Watanabe, Takumi*; Kodama, Katsuaki; Iikubo, Satoshi*; Shamoto, Shinichi; Kamiya, Toshio*; Hirano, Masahiro*; Hosono, Hideo*

Journal of Applied Physics, 105(9), p.093916_1 - 093916_8, 2009/05

 Times Cited Count:42 Percentile:82.64(Physics, Applied)

Electronic and magnetic properties of a layered compound LaMnPO are examined in relation to a newly discovered iso-structural superconductor LaFeAs(P)O. Neutron diffraction measurements, together with temperature dependent magnetic susceptibility, clarify that LaMnPO is an antiferromagnet at least up to 375 K. The spin moment of a Mn ion is determined to be 2.26 $$mu_{B}$$ at room temperature, and the spin configuration is antiparallel in the Mn-P plane and parallel to between the Mn-P planes, which is rather different from that of LaFeAsO. Optical absorption spectra, photoemission spectra, and temperature dependent electrical conductivity indicate that LaMnPO is a semiconductor. Furthermore, nominally undoped LaMnPO exhibits $$n$$-type conduction while the conduction type is changed by doping of Cu or Ca to the La sites, indicating that LaMnPO is a bipolar conductor. Density functional calculation using the GGA+U approximation supports the above conclusions; the electronic band structure has an open band gap and the antiferromagnetic spin configuration is more stable than the ferromagnetic one.

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

 Times Cited Count:34 Percentile:82.32(Physics, Multidisciplinary)

Journal Articles

Lattice dynamics of LaFeAsO$$_{1-x}$$F$$_x$$ and PrFeAsO$$_{1-y}$$ via inelastic X-ray scattering and first-principles calculation

Fukuda, Tatsuo; Baron, A. Q. R.*; Shamoto, Shinichi; Ishikado, Motoyuki; Nakamura, Hiroki; Machida, Masahiko; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Iyo, Akira*; Kito, Hijiri*; et al.

Journal of the Physical Society of Japan, 77(10), p.103715_1 - 103715_4, 2008/10

 Times Cited Count:41 Percentile:84.31(Physics, Multidisciplinary)

The lattice dynamics of LaFeAsO$$_{1-x}$$F$$_x$$ ($$x$$=0, 0.1) and PrFeAsO$$_{1-y}$$ ($$ysim$$0.1) are investigated using inelastic X-ray scattering. Measurements of powder samples provide an approximation to the phonon DOS, while dispersion is measured from a single crystal of PrFeAsO$$_{1-y}$$. A model that agrees reasonably well with all of the data at room temperature is built from results of ab-initio calculations by reducing the strength of the Fe-As bond by 30%.

Journal Articles

Test results of the FER/ITER conductors in the FENIX test facility

Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Takahashi, Yoshikazu; Nishi, Masataka; Okuno, Kiyoshi; Yoshida, Kiyoshi; Nakajima, Hideo; Ando, Toshinari; Hosono, Fumikazu*; et al.

IEEE Transactions on Magnetics, 30(4), p.2042 - 2045, 1994/07

 Times Cited Count:1 Percentile:25(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Experimental results of 40-kA Nb$$_{3}$$Al cable-in-conduit conductor for fusion machines

Takahashi, Yoshikazu; Sugimoto, Makoto; Isono, Takaaki; Nakajima, Hideo; Ando, Toshinari; Oshikiri, Masayuki*; Hosono, Fumikazu*; *; *; Hanawa, Hiromi*; et al.

IEEE Transactions on Magnetics, 30(4, Part2), p.2531 - 2534, 1994/07

no abstracts in English

Journal Articles

AC losses of the Toroidal Model Pancake(Hollow conductor type)

Hosono, Fumikazu*; Sugimoto, Makoto; Tsukamoto, Hideo*; Oshikiri, Masayuki*; Hanawa, Hiromi*; Seki, Shuichi*; *; Koizumi, Norikiyo; Isono, Takaaki; Takahashi, Yoshikazu; et al.

IEEE Transactions on Applied Superconductivity, 3(1), p.535 - 538, 1993/03

 Times Cited Count:1 Percentile:24.07(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Test results of the DPC-TJ; Electromagnetic performance

*; *; Shimada, M.*; Wachi, Y.*; Fujioka, T.*; Isono, Takaaki; Okuno, Kiyoshi; Takahashi, Yoshikazu; Sugimoto, Makoto; Hiue, Hisaaki*; et al.

Cryogenics, 33(6), p.586 - 591, 1993/00

 Times Cited Count:5 Percentile:37.45(Thermodynamics)

no abstracts in English

Oral presentation

Lattice dynamics of LaFeAsO$$_{1-x}$$F$$_x$$ and PrFeAsO$$_{1-y}$$ via inelastic X-ray scattering

Fukuda, Tatsuo; Baron, A. Q. R.*; Shamoto, Shinichi; Ishikado, Motoyuki; Nakamura, Hiroki; Machida, Masahiko; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Iyo, Akira*; Kito, Hijiri*; et al.

no journal, , 

We studied the lattice dynamics of powders, LaFeAsO$$_{1-x}$$F$$_x$$ ($$x$$=0, 0.1) and PrFeAsO$$_{1-y}$$ ($$ysim$$0.4), and a single crystal, PrFeAsO$$_{1-y}$$ ($$ysim$$0.1), using inelastic X-ray scattering. The third peak in phonon density of states are found to be softened by 5 meV compared with ab-initio calculations. A model that agrees reasonably well with all of the data is built from results of ab-initio calculations by reducing the strength of the Fe-As bond by 30%.

Oral presentation

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.*; et al.

no journal, , 

no abstracts in English

Oral presentation

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.

no journal, , 

no abstracts in English

25 (Records 1-20 displayed on this page)