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ToF inelastic neutron scattering studies on quantum spin systems (CuCl)La$$B_2$$O$$_7$$ ($$B$$ = Nb, Ta)

Kawamura, Seiko  ; Nakajima, Kenji  ; Inamura, Yasuhiro; Tsujimoto, Yoshihiro*; Kitada, Atsushi*; Takeiri, Fumitaka*; Kageyama, Hiroshi*; Ajiro, Yoshitami*; Nishi, Masakazu*; Kakurai, Kazuhisa

The magnetic ground state of (CuCl)LaNb$$_2$$O$$_7$$ has been suggested to be a spin-singlet state with an excitation gap of $$Delta E sim 2.3$$ meV, while (CuCl)LaTa$$_2$$O$$_7$$ has an antiferromagnetic (AFM) ground state. The systems are suspected to be a frustrated quantum spin system due to the competition between the nearest and next-nearest exchange interactions. We have studied magnetic excitation in these systems by ToF inelastic neutron scattering technique. The measurements were performed on powder samples of (CuCl)LaNb$$_2$$O$$_7$$ and (CuCl)LaTa$$_2$$O$$_7$$ at a disk-chopper-type spectrometer AMATERAS in J-PARC. In both systems, a band-like excitation was observed at $$Delta E sim 2$$ meV. The $$Q$$ dependence of the intensity of magnetic excitation around 2 meV for (CuCl)LaNb$$_2$$O$$_7$$ well reproduces that observed at a triple-axis spectrometer, exhibiting characteristics of spin-singlet dimers. On the other hand, (CuCl)LaTa$$_2$$O$$_7$$ in the AFM state exhibits a different $$Q$$ dependence.

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