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Force constants of Cu crystals from diffuse neutron scattering measurement

中性子散漫散乱による銅の力定数解析

佐久間 隆*; Mohapatra, S. R.*; 上原 寛之*; 酒井 竜太郎*; Xianglian*; 高橋 東之*; 井川 直樹 ; Basar, K.*

Sakuma, Takashi*; Mohapatra, S. R.*; Uehara, Hiroyuki*; Sakai, Ryutaro*; Xianglian*; Takahashi, Haruyuki*; Igawa, Naoki; Basar, K.*

10K及び300Kの銅の中性子回折測定を行い、原子熱変位における相関効果より中性子散漫散乱を解析した。300KにおけるDebye-Waller温度因子から求めた銅の第1,第2及び第3最近接原子間の力定数は各々5.58, 3.63 and 2.37eV/${AA}$ $$^{2}$$である。この金属における相関効果と原子間距離の関係は結晶結合状態に依存しないことが明らかとなった。

Diffuse neutron scattering measurement on Cu crystals was performed at 10 K and 300 K and the observed diffuse scattering intensities were analyzed by including the correlation effects among thermal displacements of atoms in the theory. Using the values of correlation effects among neighboring atoms and the values of Debye-Waller temperature parameter, force constants among first, second and third nearest neighboring atoms had been evaluated. The estimated values of force constants among first, second and third nearest neighboring atoms of Cu were 5.58, 3.63 and 2.37 eV/${AA}$ $$^{2}$$ at 300 K, respectively. The relation between correlation effects and the inter-atomic distance is not depending much on the crystal binding types.

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