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論文

Coexistence of two components in magnetic excitations of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ ($$x$$ = 0.10 and 0.16)

佐藤 研太朗*; 池内 和彦*; 梶本 亮一; 脇本 秀一; 新井 正敏*; 藤田 全基*

Journal of the Physical Society of Japan, 89(11), p.114703_1 - 114703_7, 2020/11

https://doi.org/10.7566/JPSJ.89.114703
 被引用回数：6 パーセンタイル：50.41(Physics, Multidisciplinary)

To elucidate the spin dynamics of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$, which couples with the charge degree of freedom, the spin excitations spanning the characteristic energy ($$E_mathrm{cross}$$ $$sim$$ 35-40 meV) are investigated for underdoped $$x$$ = 0.10 and optimally doped (OP) $$x$$ = 0.16 through inelastic neutron scattering measurements. Analysis based on a two-component picture of high-quality data clarified the possible coexistence of upright standing incommensurate (IC) excitations with gapless commensurate (C) excitations in the energy-momentum space. The IC component weakens the intensity toward $$E_mathrm{cross}$$ with increasing energy transfer ($$hbaromega$$), whereas the C component strengthens at high-$$hbaromega$$ regions. The analysis results imply that the superposition of two components with a particular intensity balance forms an hourglass-shaped excitation in appearance. Furthermore, the temperature dependence of the intensity of each component exhibits different behaviors; the IC component disappears near the pseudo-gap temperature ($$T^*$$) upon warming, whereas the C component is robust against temperature. These results suggest the itinerant electron spin nature and the localized magnetism of the parent La$$_{2}$$CuO$$_{4}$$ in IC and C excitations, respectively, similar to the spin excitations in the OP YBa$$_{2}$$Cu$$_{3}$$O$$_{6+delta}$$ and HgBa$$_{2}$$CuO$$_{4+delta}$$ with higher superconducting-transition temperatures.

論文

Instrumental resolution of the chopper spectrometer 4SEASONS evaluated by Monte Carlo simulation

梶本 亮一; 佐藤 研太朗*; 稲村 泰弘; 藤田 全基*

AIP Conference Proceedings 1969, p.050004_1 - 050004_8, 2018/05

https://doi.org/10.1063/1.5039301
 被引用回数：6 パーセンタイル：93.93(Physics, Applied)

We performed simulations of the resolution function of the 4SEASONS spectrometer at J-PARC by using the Monte Carlo simulation package McStas. The simulations showed reasonably good agreement with analytical calculations of energy and momentum resolutions by using a simplified description. We implemented new functionalities in Utsusemi, the standard data analysis tool used in 4SEASONS, to enable visualization of the simulated resolution function and predict its shape for specific experimental configurations.

論文

Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic X-ray scattering at the oxygen $$K$$ edge

石井 賢司*; 遠山 貴巳*; 浅野 駿*; 佐藤 研太朗*; 藤田 全基*; 脇本 秀一; 筒井 健二*; 曽田 繁利*; 宮脇 淳*; 丹羽 秀治*; et al.

Physical Review B, 96(11), p.115148_1 - 115148_8, 2017/09

AA2017-0402.pdf:0.81MB

https://doi.org/10.1103/PhysRevB.96.115148
 被引用回数：29 パーセンタイル：77.9(Materials Science, Multidisciplinary)

We investigate electronic excitations in La$$_{2-x}$$(Br,Sr)$$_x$$CuO$$_4$$ using resonant inelastic X-ray scattering (RIXS) at the oxygen $$K$$ edge. We observed momentum-dependent spectral weight below 1 eV, which is consistent with theoretical calculation of the dynamical charge structure factor on oxygen orbitals in a three-band Hubbard model. Our results confirm that the momentum-dependent charge excitations exist on the order of the transfer energy ($$t$$), and the broad spectral line shape indicates damped and incoherent character of the charge excitations at the energy range in the doped Mott insulators.

論文

Temperature dependence of spin fluctuations in underdoped La$$_{1.90}$$Sr$$_{0.10}$$CuO$$_4$$

佐藤 研太朗*; 松浦 直人*; 藤田 全基*; 梶本 亮一; Ji, S.*; 池内 和彦*; 中村 充孝; 稲村 泰弘; 新井 正敏; 榎木 勝徳*; et al.

JPS Conference Proceedings (Internet), 3, p.017010_1 - 017010_6, 2014/06

https://doi.org/10.7566/JPSCP.3.017010

We studied the temperature dependence of spin excitation in the underdoped La$$_{1.90}$$Sr$$_{0.10}$$CuO$$_{4}$$ in a wide energy range. At low temperature, a clear magnetic signal emerging from incommensurate (IC) (0.5$$pm$$0.09, 0.5) positions was observed. The low-energy ($$sim$$10 meV) IC signal was confirmed at 200K, while the IC signal gradually merges upon warming and turns into a single commensurate peak centered at (0.5, 0.5) at 300 K. The overall spectral shape above $$sim$$60 meV measured at 5 K and 350 K was almost the same, meaning the weak thermal effect on the high-energy dispersion relation. This weak change in the high-energy dispersion is consistent with the localized spin picture, whereas the robust IC structure against the temperature would be difficult to explain within a simple stripe model.

論文

High-energy spin and charge excitations in electron-doped copper oxide superconductors

石井 賢司; 藤田 全基*; 佐々木 隆了*; Minola, M.*; Dellea, G.*; Mazzoli, C.*; Kummer, K.*; Ghiringhelli, G.*; Braicovich, L.*; 遠山 貴己*; et al.

Nature Communications (Internet), 5, p.3714_1 - 3714_8, 2014/04

https://doi.org/10.1038/ncomms4714
 被引用回数：89 パーセンタイル：94.27(Multidisciplinary Sciences)

We combine X-ray and neutron inelastic scattering measurements to track the doping dependence of both spin and charge excitations in electron-doped materials. Copper $$L_3$$ resonant inelastic X-ray scattering spectra show that magnetic excitations shift to higher energy upon doping. Their dispersion becomes steeper near the magnetic zone center and they deeply mix with charge excitations, indicating that electrons acquire a highly itinerant character in the doped metallic state. Moreover, above the magnetic excitations, an additional dispersing feature is observed near the $$Gamma$$-point, and we ascribe it to particle-hole charge excitations. These properties are in stark contrast with the more localized spin-excitations (paramagnons) recently observed in hole-doped compounds even at high doping-levels.

口頭

X線・中性子非弾性散乱による電子ドープ型銅酸化物超伝導体のスピン・電荷励起の観測

石井 賢司; 藤田 全基*; 佐々木 隆了*; Minola, M.*; Dellea, G.*; Mazzoli, C.*; Kummer, K.*; Ghiringhelli, G.*; Braicovich, L.*; 遠山 貴己*; et al.

no journal, , 

銅酸化物超伝導体において、母物質の反強磁性モット絶縁体からキャリアドープにより金属・超伝導体化していく過程でスピン・電荷励起がどのように変遷してくか、また、それがホールドープと電子ドープでどのように異なるかは重要な問題である。これまでスピン励起に対して主に利用されてきた中性子非弾性散乱に加えて、内殻共鳴を利用したX線非弾性散乱(RIXS)を相補的に利用して行った電子ドープ型銅酸化物超伝導体のスピン・電荷励起の研究結果について報告する。

口頭

モンテカルロシミュレーションによるチョッパー分光器の分解能評価

梶本 亮一; 稲村 泰弘; 佐藤 研太朗*; 藤田 全基*

no journal, , 

McStasを用いたモンテカルロシミュレーションと、J-PARCのデータ解析ソフト「空蝉」を組み合わせ、J-PARCのチョッパー型分光器「四季」の分解能の計算と可視化を試みた。さらに簡単なケースについて解析的な計算も行い、シミュレーションの結果と比較した。本発表ではこうした分解能計算の方法について紹介するとともに、その活用法や問題点についても議論する。

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