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Journal Articles

Mean-field study of the Bose-Hubbard model in the Penrose lattice

Ghadimi, R.*; Sugimoto, Takanori*; Toyama, Takami

Physical Review B, 102(22), p.224201_1 - 224201_9, 2020/12

Journal Articles

Magnetic phase diagram of a frustrated spin ladder

Sugimoto, Takanori*; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

Physical Review B, 97(14), p.144424_1 - 144424_10, 2018/04

AA2018-0074.pdf:1.54MB

 Times Cited Count:5 Percentile:30.6(Materials Science, Multidisciplinary)

Journal Articles

Quasi-spin correlations in a frustrated quantum spin ladder

Sugimoto, Takanori*; Mori, Michiyasu; Toyama, Takami*; Maekawa, Sadamichi

Physics Procedia, 75, p.861 - 867, 2015/12

 Times Cited Count:0 Percentile:0.04

Journal Articles

Lifshitz transition induced by magnetic field in frustrated two-leg spin-ladder systems

Sugimoto, Takanori*; Mori, Michiyasu; Toyama, Takami*; Maekawa, Sadamichi

JPS Conference Proceedings (Internet), 8, p.034005_1 - 034005_6, 2015/09

Journal Articles

Magnetization plateaus by reconstructed quasispinons in a frustrated two-leg spin ladder under a magnetic field

Sugimoto, Takanori*; Mori, Michiyasu; Toyama, Takami*; Maekawa, Sadamichi

Physical Review B, 92(12), p.125114_1 - 125114_6, 2015/09

AA2015-0451.pdf:0.43MB

 Times Cited Count:9 Percentile:42.32(Materials Science, Multidisciplinary)

Journal Articles

Site occupancy of interstitial deuterium atoms in face-centred cubic iron

Machida, Akihiko; Saito, Hiroyuki; Sugimoto, Hidehiko*; Hattori, Takanori; Sano, Asami; Endo, Naruki*; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.

Nature Communications (Internet), 5, p.5063_1 - 5063_6, 2014/09

 Times Cited Count:47 Percentile:86.18(Multidisciplinary Sciences)

Iron hydride FeH$$_x$$, is thermodynamically stable only at high hydrogen pressure of several GPa. To investigate the hydrogenation process and hydrogen state in iron hydride, it is necessary to carry out the in-situ measurement under high pressure and high temperature. In this study, we performed the in-situ neutron diffraction measurement of Fe-D system using the high pressure neutron diffractometer PLANET in the MLF, J-PARC, and determined the deuterium occupying sites and occupancies in fcc-FeD$$_x$$. We found the minor occupation of tetrahedral sites under high pressure and high temperature. We considered the mechanism of the minor occupation based on the Quantum-mechanical calculation.

Journal Articles

Spin-spin correlation enhanced by impurities in a frustrated two-leg spin ladder

Sugimoto, Takanori*; Mori, Michiyasu; Toyama, Takami*; Maekawa, Sadamichi

JPS Conference Proceedings (Internet), 3, p.014016_1 - 014016_5, 2014/06

Journal Articles

Effects of frustration on magnetic excitations in a two-leg spin-ladder system

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

Physical Review B, 87(15), p.155143_1 - 155143_7, 2013/04

 Times Cited Count:7 Percentile:37.27(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetic excitations in a frustrated two-leg spin-ladder model

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

no abstracts in English

Oral presentation

Dynamical spin correlation function in a frustrated two-leg spin-ladder system

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

We numerically study the magnetic excitations in a frustrated two-leg spin-ladder system, in which all magnetic exchange interactions, i.e., the nearest-, next-nearest-neighbor sites in the leg direction, and the nearest-neighbor sites in the rung direction, are antiferromagnetic. This is a minimal model describing a low-dimensional quantum spin compound, BiCu$$_2$$PO$$_6$$. We calculate a dynamical spin correlation function at zero temperature by using the dynamical density-matrix renormalization-group method in possible magnetic phases, columnar dimer and rung singlet. The columnar dimer phase is characterized by multi-spinon excitations, while the rung singlet phase is dominated by a triplon excitation, which is the triplet excitation in the rung direction. Difference between these two types of excitations appears in the spectral weight, in particular, of the bonding and anti-bonding modes in the rung direction. Therefore, we can distinguish one phase from the other by distribution of the spectral weight. In addition, we examine frustration effect on the bonding mode, so-called bound triplon, with a perturbation theory from the strong coupling limit in the rung direction. Our study is expected to be useful to analyze inelastic neutron scattering data for BiCu$$_2$$PO$$_6$$.

Oral presentation

Magnetic anisotropy and magnetic field effects in a frustrated two-leg spin-ladder system

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

no abstracts in English

Oral presentation

Magnetic excitations and frustration effect in a frustrated two-leg spin-ladder system

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

Oral presentation

Phase transition induced by magnetic field in a two-leg spin ladder

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

Oral presentation

Effects of impurity in a two-leg spin ladder

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

Oral presentation

Effects of magnetic anisotropy and magnetic field on a frustrated two-leg spin-ladder system

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

Oral presentation

Long-range order induced by impurities in a frustrated two-leg spin ladder BiCu$$_{2}$$PO$$_{6}$$

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

no abstracts in English

Oral presentation

Effects of magnetic field on a frustrated two-leg spin ladder

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

no abstracts in English

Oral presentation

Successive magnetic-phase transitions in a frustrated two-leg spin ladder

Sugimoto, Takanori; Mori, Michiyasu; Toyama, Takami; Maekawa, Sadamichi

no journal, , 

18 (Records 1-18 displayed on this page)
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