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- W2964335455 abstract "Recent neutron diffraction studies have shown that in Cr$_2$(W,Te)O$_6$ systems, which consist of bilayers with strong antiferromagnetic inter-bilayer coupling between Cr moments, the intra-bilayer coupling between the Cr moments can be tuned from ferro (for W) to antiferro (for Te). {it Ab initio} density functional calculations provide a microscopic understanding of the magnetic structure but cannot explain the magnitude of the ordered Cr$^{3+}$ moments. In order to understand the reduction of the ordered moment caused by quantum spin fluctuations (QSF) we have studied the magnon dispersion and the sublattice magnetization using a two parameter quantum Heisenberg spin Hamiltonian with tunable intra-($j$) and antiferromagnetic inter- ($J$) bilayer couplings. In the $j=0$ limit the system reduces to decoupled quantum dimers. The magnon dispersion and normalized sublattice magnetization (NSM) have been calculated using non-linear spin wave theory up to second-order corrections ($1/S^2$) in spin $S$. The effect of $J$ is quite dramatic when $j$ is ferromagnetic, a large peak in magnon dispersion appears at the corner of the Brillouin zone for large $J$ (realistic case) in addition to changing the quadratic dispersion to linear. Inelastic neutron scattering experiments can confirm this theoretical prediction. The effect of $J$ on NSM is simple when $j$ is ferromagnetic, NSM decreases monotonically with $J$. In contrast when $j$ is antiferromagnetic the effect of $J$ is to suppress QSF effect until $Jsim j$ but further increase in $J$ gives rise to increasing QSF reduction of the NSM. These theoretical results are qualitatively consistent with experiment." @default.
- W2964335455 created "2019-07-30" @default.
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- W2964335455 date "2016-03-17" @default.
- W2964335455 modified "2023-09-23" @default.
- W2964335455 title "Quantum Spin Fluctuations and magnons in antiferromagnetically coupled bilayers with tuneable intra-bilayer exchange - the case of Cr$_2$W(Te)O$_6$" @default.
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