Spin dynamics of frustrated spin-2 chain system Ca3Co2O6 in a magnetic field
Ising-like spin-chain compound Ca3Co2O6 has recently attracted a lot of experimental and theoretical attention because of its interesting magnetic properties, such as field-induced magnetization steps, time-dependent magnetic order. In our recent inelastic neutron scattering study, the observed large ratio of the spin gap to the bandwidth (~8) and the absence of dispersion perpendicular to the chains indicate the highly 1D nature of this material in spin space and in real space. In the proposed work, we want to investigate the effect of a magnetic field on the spin dynamics by measuring the magnetic excitations in the longitudinal and transverse field. It is theoretically predicted that the gap in the magnetic excitation spectrum of Ising spin-chain softens as a magnetic field is applied transverse to the preferred spin direction and goes to zero at critical field. However, different ratios of interchain to intrachain interactions and different degrees of deviation from the ideal Ising spin Hamiltonian, is expected to modify the magnetic excitations.
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JAIN Anil; D.T. Adroja; Dmytro Inosov; IVANOV Alexandre; KEIMER Bernhard; ONYKIIENKO Yevhen; PORTNICHENKO Pavlo and Yuliia Tymoshenko. (2015). Spin dynamics of frustrated spin-2 chain system Ca3Co2O6 in a magnetic field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1346
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