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Elementary excitations in an S=1/2 antiferromagnetic chain KCuGaF$$_{6}$$

S=1/2反強磁性鎖KCuGaF$$_{6}$$の素励起

田中 秀数*; 栗田 伸之*; 梅垣 いづみ*; 小野 俊雄*; Laver, M.*; Niedermayer, Ch.*; R$"u$egg, Ch.*; 河村 聖子   ; 中島 健次  ; 加倉井 和久

Tanaka, Hidekazu*; Kurita, Nubuyuki*; Umegaki, Izumi*; Ono, Toshio*; Laver, M.*; Niedermayer, Ch.*; R$"u$egg, Ch.*; Kawamura, Seiko; Nakajima, Kenji; Kakurai, Kazuhisa

Neutron scattering experiments using AMATERAS at J-PARC in zero magnetic field and RITA-II at PSI in magnetic field have been performed to investigate elementary excitations in the S=1/2 antiferromagnetic spin chain system KCuGaF$$_{6}$$. The lower bound of magnetic excitations is well described by the des Cloizeaux and Pearson (dCP) mode and the spinon continuum above the dCP mode is observed.

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