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目時 直人; 山内 宏樹; 松田 雅昌*; Fernandez-Baca, J. A.*; 綿貫 竜太*; 萩原 雅人*
Physical Review B, 97(17), p.174416_1 - 174416_10, 2018/05
被引用回数：7 パーセンタイル：30.02(Materials Science, Multidisciplinary)多重の秩序変数を伴うf電子系NdBの磁気構造を中性子偏極解析によって明らかにした。面内の磁気モーメントについては
と呼ばれる、単位格子内の磁気モーメントが全て外側または内側に向いた構造を確認した。これは最近の我々の粉末回折の結果と一致する。一方、この構造にc軸モーメントの反強磁性ダイマー構造(
)が共存することが新たにわかり、粉末回折実験の解析の前提が崩れていることがわかった。またIII相及びIV相において(0.14,0.14,0.1)および(0.2,0,0.1)の波数を伴うインコメ相についても、c軸方向の磁気モーメントが変調していることを明らかにした。面内モーメントは主たる秩序変数として振る舞い、ランダウ理論を用いた解析によりc軸モーメントは誘起秩序変数として表されること、すなわち、高次の磁気的または多極子の相互作用に起因することがわかった。
元川 竜平; 遠藤 仁*; 長尾 道弘*; Heller, W. T.*
Solvent Extraction and Ion Exchange, 34(5), p.399 - 406, 2016/07
被引用回数：5 パーセンタイル：19.51(Chemistry, Multidisciplinary)We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO
) and tri-n-butyl phosphate (TBP), which enabled decomposition of the intensity distribution of small-angle neutron scattering (SANS) into the coherent and incoherent scattering components. The coherent scattering intensity, containing structural information, and the incoherent scattering compete over a wide range of magnitude of scattering vector, 
, specifically when is larger than 
1/
, where is the radius of gyration of scatterer. Therefore, it is important to determine the incoherent scattering intensity exactly to perform an accurate structural analysis from SANS data when is small, such as the aforementioned extracted coordination species. Although NPA is the best method for evaluating the incoherent scattering component for accurately determining the coherent scattering in SANS, this method is not used frequently in SANS data analysis because it is technically challenging. In this study, we successfully demonstrated that experimental determination of the incoherent scattering using NPA is suitable for sample systems containing a small scatterer with a weak coherent scattering intensity, such as extracted complexes in biphasic solvent extraction system.
元川 竜平; 遠藤 仁
no journal, ,
We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO) and tri-n-butyl phosphate (TBP), which enabled decomposition of the intensity distribution of small-angle neutron scattering (SANS) into the coherent and incoherent scattering components. The coherent scattering intensity, containing structural information, and the incoherent scattering compete over a wide range of magnitude of scattering vector, q, specifically when q is larger than 1/R, where R is the size of scatterer. Therefore, it is important to determine the incoherent scattering intensity exactly to perform an accurate structural analysis from SANS data when R is small, such as the aforementioned extracted coordination species. Although NPA is the best method for evaluating the incoherent scattering component for accurately determining the coherent scattering in SANS, this method is not used frequently in SANS data analysis because it is technically challenging. In this study, we successfully demonstrated that experimental determination of the incoherent scattering using NPA is suitable for sample systems containing a small scatterer with a weak coherent scattering intensity, such as extracted complexes in biphasic solvent extraction systems.
