Inelastic neutron scattering study on CuMoO

Kuroe, Haruhiko*; Hamasaki, Tomoyuki*; Hase, Masashi*; Kaneko, Koji   ; Metoki, Naoto   ; Matsuda, Masaaki; Kakurai, Kazuhisa; Oka, Kunihiko*; Ito, Toshimitsu*; Eisaki, Hiroshi*

We have measured inelastic neutron scattering in CuMoO to study its magnetic-excitation dispersion curves. This material can be treated as a complex of the following two spin subsystems. (1) Quasi-one-dimensional antiferromagnetic (AF) spin chain with the intrachain interaction pJ4 = 6.3 meV, where p is the renormalization factor depending on the system dimension, together with the ferromagnetic and AF interchain interactions -Ja = J 0.01pJ4. (2) AF spin dimers with the interaction J3 = 5.8 meV. The hybridization parameter, representing the intersubsystem interaction between these subsystems, is estimated as Eint sin (k), where Eint = 1.6 meV. The modulation of the molecular field generated by the spin precession in the excited state of the quasi-one-dimensional spin chain plays an important role in this hybridization.