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Journal Articles

Spin wave dispersion just above the magnetic order-order transition in the metallic antiferromagnet Mn$$_{3}$$Pt

Ibuka, Soshi*; Yokoo, Tetsuya*; Ito, Shinichi*; Kamazawa, Kazuya*; Nakamura, Mitsutaka; Imai, Motoharu*

Journal of Physics; Conference Series, 868(1), p.012017_1 - 012017_6, 2017/07

Spin wave dispersion of the metallic antiferromagnet Mn$$_{3}$$Pt was investigated just above the order-order transition temperature by using the inelastic neutron scattering technique. The spin wave dispersion at $$T$$ = 400 K along [100], [110] and [111] directions was isotropic within the measurement accuracy. These results show that large reduction of the stiffness constant with increasing temperature, and indicate the itinerancy of the magnetic moments.

Journal Articles

Electroplating of the superconductive boride MgB$$_{2}$$ from molten salts

Abe, Hideki*; Yoshii, Kenji; Nishida, Kenji*; Imai, Motoharu*; Kitazawa, Hideaki*

Journal of Physics and Chemistry of Solids, 66(2-4), p.406 - 409, 2005/04

https://doi.org/10.1016/j.jpcs.2004.06.051
 Times Cited Count：8 Percentile：35.83(Chemistry, Multidisciplinary)

An electroplating technique of the superconductive boride MgB$$_{2}$$ onto graphite substrates is reported. Films of MgB$$_{2}$$ with a thickness of tens micrometer were fabricated on the planar and curved surfaces of graphite substrates by means of electrolysis on a mixture of magnesium chloride, potassium chloride, sodium chloride, and magnesium borate fused at high temperatures in an Ar atmosphere. The electrical resistivity and magnetization measurements revealed that the electroplated MgB$$_{2}$$ films undergo a superconducting transition with the critical temperature of 36 K.

Journal Articles

Electroplating of the superconductive boride MgB$$_{2}$$ from molten salts

Abe, Hideki*; Yoshii, Kenji; Nishida, Kenji*; Imai, Motoharu*; Kitazawa, Hideaki*

Journal of Physics and Chemistry of Solids, 66(1), p.406 - 409, 2005/01

no abstracts in English

Journal Articles

Superconducting properties of MgB$$_{2}$$ films electroplated to stainless steel substrates

Abe, Hideki*; Nishida, Kenji*; Imai, Motoharu*; Kitazawa, Hideaki*; Yoshii, Kenji

Applied Physics Letters, 85(25), p.6197 - 6199, 2004/12

https://doi.org/10.1063/1.1839644
 Times Cited Count：15 Percentile：50.47(Physics, Applied)

no abstracts in English

Journal Articles

Superconductivity of M$$_{I}$$(M$$_{II}$$$$_{0.5}$$,Si$$_{0.5}$$)$$_{2}$$ (M$$_{I}$$=Sr and Ba, M$$_{II}$$=Al and Ga), ternary silicides with the AlB$$_{2}$$-type structure

Imai, Motoharu*; Nishida, Kenji*; Kimura, Takashi*; Kitazawa, Hideaki*; Abe, Hideki*; Kito, Hijiri*; Yoshii, Kenji

Physica C, 382(4), p.361 - 366, 2002/11

https://doi.org/10.1016/S0921-4534(02)01798-7
 Times Cited Count：58 Percentile：88.08(Physics, Applied)

no abstracts in English

Journal Articles

Single-crystal growth of silver-lead oxide Ag$$_{5}$$Pb$$_{2}$$O$$_{6}$$ from fused nitrates

Abe, Hideki*; Ye, J.*; Imai, Motoharu*; Yoshii, Kenji; Matsushita, Akiyuki*; Kitazawa, Hideaki*

Journal of Crystal Growth, 241(3), p.347 - 351, 2002/06

https://doi.org/10.1016/S0022-0248(02)01317-9
 Times Cited Count：10 Percentile：58.03(Crystallography)

no abstracts in English

Journal Articles

Crystal structure of NiO under high pressure

Eto, Tetsujiro*; Endo, Shoichi*; Imai, Motoharu*; Katayama, Yoshinori; Kikegawa, Takumi*

Physical Review B, 61(22), p.14984 - 14988, 2000/06

https://doi.org/10.1103/PhysRevB.61.14984
 Times Cited Count：55 Percentile：88.51(Materials Science, Multidisciplinary)

The pressure effect on the lattice constant of NiO with the rhombohedral distorted B1 structure was studied up to 141 GPa by ${em in situ}$ angle-dispersive x-ray diffraction using synchrotron radiation, an imaging plate, and a diamond anvil cell. The lattice constant $$a$$ and $$c$$, expressed in the hexagonal lattice, decrease monotonously with increasing pressure. The axial rage $$c/a$$ decreases monotonously with increasing pressure, indicating the distortion in the rhombohedral [111] direction becomes larger as pressure increases. The signiifcant change of $$c/a$$ above 60 GPa, suggested by a recent theoretical calculation, was not observed.

Journal Articles

Crystal structure of NiO under high pressure

Eto, Tetsujiro*; Endo, Shoichi*; Imai, Motoharu*; Katayama, Yoshinori; Kikegawa, Takumi*

Science and Technology of High Pressure (Proceedings of AIRAPT-17), p.487 - 490, 2000/00

The pressure effect on the lattice constant of NiO with the rhombohedral distorted B1 structure was studied up to 141 GPa by ${em in situ}$ angle-dispersive x-ray diffraction using synchrotron radiation and an imaging plate, with reference to a recent theoretical calculation within the density-functional formalism with the local-spin density approcximation. The lattice constant $$a$$ and $$c$$, expressed in the hexagonal lattice, decrease monotonously with increasing pressure. The axial rage $$c/a$$ decreases monotonously with increasing pressure, indicating the enhancement of the rhombohedral distortion. The signiifcant change of $$c/a$$ above 60 GPa suggested by the calculation was not observed.

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