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Spin-flop phase in a honeycomb antiferromagnet Mn$$_{0.84}$$Mg$$_{0.16}$$TiO$$_{3}$$

社本 真一; 山内 宏樹; 池内 和彦*; Lee, M. K.*; Chang, L.-J.*; Garlea, V. O.*; Hwang, I. Y.*; Lee, K. H.*; Chung, J.-H.*

Journal of the Physical Society of Japan, 90(9), p.093703_1 - 093703_4, 2021/09

 被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)



Neutron scattering study on yttrium iron garnet for spintronics

南部 雄亮*; 社本 真一

Journal of the Physical Society of Japan, 90(8), p.081002_1 - 081002_15, 2021/08

 被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)

スピントロニクス用イットリウム鉄ガーネットの中性子散乱研究について、長期課題2017L0300の"Cross correlation dynamics under a strain field"の成果を中心にSPECIAL TOPICSのReviewとしてまとめた。


Magnetic structure of short-range ordering in intermetallic antiferromagnet Mn$$_3$$RhSi

樹神 克明; 本田 孝志*; 山内 宏樹; 社本 真一*; 池田 一貴*; 大友 季哉*

Journal of the Physical Society of Japan, 90(7), p.074710_1 - 074710_7, 2021/07

 被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)

Magnetic pair distribution function (mPDF) of intermetallic antiferromagnet Mn$$_3$$RhSi is estimated from the powder neutron diffraction data. The mPDF exhibits negative peak at about $$r$$ = 2.7 ${AA}$ corresponding to the nearest neighbor Mn-Mn distance above the antiferromagnetic transition temperature $$T_{N}$$. Below $$T_{N}$$, the mPDF is a superposition of the mPDF with the negative peak at about $$r$$ = 2.7 ${AA}$ and the mPDF calculated from the antiferromagnetic structure which is determined by the previous neutron diffraction study, indicating the coexistence of the short range ordering and the antiferromagnetic long range ordering. The mPDF of the short range ordering is not reproduced by the magnetic structure model with the symmetry consistent with that of the crystal structure. The possible magnetic structure which can reproduce the observed mPDF of the short range ordering is proposed.


Gallium-effect in a lead-free solder for silver-sheathed superconducting tape

社本 真一; Lee, M. K.*; 藤村 由希; 近藤 啓悦; 伊藤 孝; 池内 和彦*; 保田 諭; Chang, L.-J.*

Materials Research Express (Internet), 8(7), p.076303_1 - 076303_6, 2021/07

 被引用回数:0 パーセンタイル:0(Materials Science, Multidisciplinary)

Pb, Ga、およびGaをドープした鉛フリーのSn-Ag-Cuはんだを使用して、銀被覆DI-BISCCOタイプHテープを使用した低接合抵抗率に対するガリウム効果を研究した。その結果について報告する。


Spin wave excitations in honeycomb antiferromagnet MnTiO$$_{3}$$

Hwang, I. Y.*; Lee, K. H.*; Chung, J.-H.*; 池内 和彦*; Garlea, V. O.*; 山内 宏樹; 赤津 光洋*; 社本 真一

Journal of the Physical Society of Japan, 90(6), p.064708_1 - 064708_6, 2021/06

 被引用回数:1 パーセンタイル:72.06(Physics, Multidisciplinary)



Magnetic pair distribution function of spin-glass system Mn$$_{0.5}$$Fe$$_{0.5}$$TiO$$_3$$

樹神 克明; 本田 孝志*; 池田 一貴*; 社本 真一; 大友 季哉*

JPS Conference Proceedings (Internet), 33, p.011059_1 - 011059_6, 2021/03

We have performed powder diffraction measurement on the typical spin-glass system Mn$$_{0.5}$$Fe$$_{0.5}$$TiO$$_3$$ using the neutron total scattering spectrometer NOVA installed in J-PARC to apply the mPDF analysis to the short-range correlation in the spin-glass phase. The mPDF obtained from the magnetic scattering intensity can be reproduced by the linear combination of the mPDFs calculated from the antiferromagnetic structures of MnTiO$$_3$$ and FeTiO$$_3$$, consistent with the coexistence of two different antiferromagnetic correlations in the spin-glass phase.


Broken C$$_{4}$$ symmetry in the tetragonal state of uniaxial strained BaCo$$_{0.9}$$Ni$$_{0.1}$$S$$_{1.9}$$

社本 真一; 山内 宏樹; 池内 和彦*; 梶本 亮一; 家田 淳一

Physical Review Research (Internet), 3(1), p.013169_1 - 013169_9, 2021/02

A compound with large anions is known to show large compressibility whereby a novel response may emerge from the degenerated state by a uniaxial pressure. Neutron scattering study of BaCo$$_{0.9}$$Ni$$_{0.1}$$S$$_{1.9}$$ crystal reveals that the tetragonal insulating state has two magnetic domains with in-plane anisotropic antiferromagnetic wave vectors $$bf Q_1$$=($$pi$$, 0) and $$bf Q_2$$=(0, $$pi$$). One magnetic domain with $$bf Q_2$$ becomes dominant under a weak uniaxial pressure of 1 MPa without a structural phase transition. Correspondingly, the in-plane broken C$$_{4}$$ symmetry is observed in the in-plane magnetic excitation. The domain-ratio changes under a uniaxial pressure in the tetragonal state is only slightly smaller than that in the orthorhombic state.


Ultralow-energy magnon anomaly in yttrium iron garnet

社本 真一; 安井 幸夫*; 松浦 直人*; 赤津 光洋*; 小林 義明*; 根本 祐一*; 家田 淳一

Physical Review Research (Internet), 2(3), p.033235_1 - 033235_6, 2020/08



High-temperature short-range order in Mn$$_3$$RhSi

山内 宏樹; Sari, D. P.*; 渡邊 功雄*; 安井 幸夫*; Chang, L.-J.*; 近藤 啓悦; 伊藤 孝; 石角 元志*; 萩原 雅人*; Frontzek, M. D.*; et al.

Communications Materials (Internet), 1, p.43_1 - 43_6, 2020/07



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

石角 元志*; 樹神 克明; 梶本 亮一; 中村 充孝; 稲村 泰弘; 池内 和彦*; Ji, S.*; 新井 正敏*; 社本 真一

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



Local structure of functional solids

社本 真一

Journal of the Physical Society of Japan, 88(8), p.081008_1 - 081008_11, 2019/08


 被引用回数:1 パーセンタイル:20.66(Physics, Multidisciplinary)

The local structure study reveals important aspects of the physical properties, because it is closely related to the electronic structure. Some neutron total scattering results are reviewed to show the local functional properties of solids from optical recording to negative thermal expansion to Mott transition materials.


Probing the quantum phase transition in Mott insulator BaCoS$$_{2}$$ tuned by pressure and Ni substitution

Guguchia, Z.*; Frandsen, B. A.*; Santos-Cottin, D.*; 社本 真一; Gauzzi, A.*; 植村 泰朋*; 他12名*

Physical Review Materials (Internet), 3(4), p.045001_1 - 045001_9, 2019/04

 被引用回数:3 パーセンタイル:28.74(Materials Science, Multidisciplinary)



Asymmetrically optimized structure in a high-$$T_{rm c}$$ single unit-cell FeSe superconductor

深谷 有喜; Zhou, G.*; Zheng, F.*; Zhang, P.*; Wang, L.*; Xue, Q.-K.*; 社本 真一

Journal of Physics; Condensed Matter, 31(5), p.055701_1 - 055701_6, 2019/02

 被引用回数:4 パーセンタイル:41.11(Physics, Condensed Matter)



High-energy spin fluctuation in low-T$$_{c}$$ iron-based superconductor LaFePO$$_{0.9}$$

石角 元志*; 社本 真一; 樹神 克明; 梶本 亮一; 中村 充孝; Hong, T.*; Mutka, H.*

Scientific Reports (Internet), 8, p.16343_1 - 16343_6, 2018/11

 被引用回数:2 パーセンタイル:29.78(Multidisciplinary Sciences)



Elastic and dynamical structural properties of La and Mn-doped SrTiO$$_{3}$$ studied by neutron scattering and their relation with thermal conductivities

梶本 亮一; 中村 充孝; 村井 直樹; 社本 真一; 本田 孝志*; 池田 一貴*; 大友 季哉*; 畑 博人*; 江藤 貴弘*; 野田 正亮*; et al.

Scientific Reports (Internet), 8(1), p.9651_1 - 9651_8, 2018/06

 被引用回数:4 パーセンタイル:32.16(Multidisciplinary Sciences)

The electron-doped SrTiO$$_{3}$$ exhibits good thermoelectric properties, which makes this material a promising candidate of an n-type oxide thermoelectric device. Recent studies indicated that only a few percent co-doping of La and Mn in SrTiO$$_{3}$$ substantially reduces the thermal conductivity, thereby greatly improving the thermoelectric figure of merit at room temperature. Our time-of-flight neutron scattering studies revealed that by doping both La and Mn into SrTiO$$_{3}$$, the inelastic scattering spectrum shows a momentum-independent increase in the low-energy spectral weight approximately below 10 meV. The increase in the low-energy spectral weight exhibits a clear correlation with thermal conductivity. The correlation is attributed to dynamical and local structural fluctuations caused by the Jahn-Teller instability in Mn$$^{3+}$$ ions coupled with the incipient ferroelectric nature of SrTiO$$_{3}$$, as the origin of the low thermal conductivity.


Neutron scattering study of yttrium iron garnet

社本 真一; 伊藤 孝; 大西 弘明; 山内 宏樹; 稲村 泰弘; 松浦 直人*; 赤津 光洋*; 樹神 克明; 中尾 朗子*; 茂吉 武人*; et al.

Physical Review B, 97(5), p.054429_1 - 054429_9, 2018/02

 被引用回数:10 パーセンタイル:63.24(Materials Science, Multidisciplinary)



Alternative equation on magnetic pair distribution function for quantitative analysis

樹神 克明; 池田 一貴*; 社本 真一; 大友 季哉*

Journal of the Physical Society of Japan, 86(12), p.124708_1 - 124708_8, 2017/12

 被引用回数:4 パーセンタイル:44.41(Physics, Multidisciplinary)

We derive an alternative equation of magnetic pair distribution function (mPDF) related to the mPDF equation given in a preceding study (B. A. Frandsen, X. Yang, and S. J. L. Billinge, Acta Crystallogr. A, ${bf70}$, 3 (2014)) for quantitative analysis of realistic experimental data. The additional term related to spontaneous magnetization included in the equation is particularly important for the mPDF analysis of ferromagnetic materials. Quantitative estimation of mPDF from neutron diffraction data is also shown. The experimental mPDFs estimated from the neutron diffraction data of the ferromagnet MnSb and the antiferromagnet MnF$$_2$$ are quantitatively consistent with the mPDFs calculated using the presented equation.


Asymmetric structure of germanene on an Al(111) surface studied by total-reflection high-energy positron diffraction

深谷 有喜; 松田 巌*; Feng, B.*; 望月 出海*; 兵頭 俊夫*; 社本 真一

2D Materials (Internet), 3(3), p.035019_1 - 035019_7, 2016/09

 被引用回数:34 パーセンタイル:80.8(Materials Science, Multidisciplinary)



Local structural analysis of half-metallic ferromagnet CrO$$_2$$

樹神 克明; 池田 一貴*; 礒部 正彦*; 武田 晃*; 伊藤 正行*; 上田 寛*; 社本 真一; 大友 季哉*

Journal of the Physical Society of Japan, 85(9), p.094709_1 - 094709_5, 2016/09

 被引用回数:1 パーセンタイル:13.94(Physics, Multidisciplinary)

We have performed powder neutron diffraction on the half-metallic ferromagnet CrO$$_2$$ which has a rutile-type crystal structure with a tetragonal unit cell. Although the powder diffraction pattern can be fitted by the reported crystal structure including a single Cr site, the atomic pair distribution function (PDF) can be fitted by the structural model with an orthorhombic unit cell including two kinds of inequivalent Cr sites. The difference between the valences of the two inequivalent Cr sites, $$delta$$ of Cr$$^{+4pmdelta}$$, estimated from the local structural parameters is about 0.06. The shapes of the two CrO$$_6$$ octahedra are slightly different, suggesting the short-range orbital ordering of the Cr 3$$d$$ orbitals. The lattice distortion and the improvement of the fitting to the PDF obtained using the locally distorted structure model are apparent in the region below about 10 ${AA}$, suggesting that the domain size or correlation length of the locally distorted structure is about 10 ${AA}$, roughly corresponding to the size of two unit cells.


Spacing between graphene and metal substrates studied with total-reflection high-energy positron diffraction

深谷 有喜; 圓谷 志郎; 境 誠司; 望月 出海*; 和田 健*; 兵頭 俊夫*; 社本 真一

Carbon, 103, p.1 - 4, 2016/07

 被引用回数:13 パーセンタイル:52.44(Chemistry, Physical)


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