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

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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