Hybridization of magnetic excitations between quasi-one-dimensional spin chains and spin dimers in Cu3Mo2O9 observed using inelastic neutron scattering

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

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Abstract

We have studied the exchange interactions and the hybridization effects of two kinds of magnetic excitations in Cu3Mo2O9 by using inelastic neutron scattering. This compound has two magnetic subsystems, i.e., the quasi-one-dimensional (q1D) antiferromagnetic (AF) spin system and the quantum spin dimers. We observe two branches in the magnetic excitations and obtain the magnetic parameters as follows. We evaluate the intrachain interaction J4=4.0 meV in the q1D AF spin system and the intradimer interaction J3=5.8 meV in the spin dimers. Applying the interchain mean-field theory (CMF) with the random-phase approximation (RPA), we estimate the mass gap of the q1D AF spin system as 1.2 meV. Using the CMF-RPA theory, the ferromagnetic interchain interaction between the magnetic chain along the a axis and the AF one between the magnetic chains at the center and the corner of the unit cell are estimated to be -Ja=J αβ=0.19 meV, respectively. The hybridization parameter, which represents the intersubsystem interaction, has the wave-vector dependence as Eintsin(πk), where Eint=1.6 meV and kb * denotes the wave vector of magnetic excitation along the b* direction. The modulation of the molecular field generated by the magnetic excitation of the q1D AF spin system plays an important role in this hybridization.

Original languageEnglish
Article number184423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number18
DOIs
StatePublished - May 23 2011
Externally publishedYes

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