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Phonon Control of Magnetic Relaxation in the Pyrochlore Slab SCGO through Rocking Motion of the Kagome-Plane Triangles | | M. Zbiri
; M. R. Johnson
; H. Mutka
; C. Payen
; H. Schober
; | | Date: |
22 Oct 2008 | | Abstract: | We have performed ab-initio lattice dynamics calculations and new inelastic
neutron scattering experiments to investigate the recently discovered,
phonon-driven, magnetic relaxation in the pyrochlore slab material
SrCr_{9x}Ga_{12-9x}O_{19} (SCGO) [Mutka et al. PRL 97 047203 (2006)].
Experimentally, the magnetic signal in SCGO masks the phonon signal and we have
therefore focussed on the nonmagnetic counterpart SrGa_{12}O_{19} (SGO).
Results of simulations in SGO show a peak in the vibrational density of states
having a frequency which agrees well with the observations for both SCGO and
SGO. This peak includes a Gamma-point mode which is Raman active in agreement
with the experimental data. However the strongest contribution in the
vibrational density of states comes from modes at the M-point of the hexagonal
system. We validate the importance of the M-point by comparing the Q-dependent
intensity of the measured and calculated dynamic structure factor, S(Q,w), for
the powder SGO sample. By inspecting the displacement vectors of the modes at
the Gamma and M points, these modes are seen to modulate the distances between
magnetic sites, via the dynamics of the triangles in the kagome planes, and
therefore drive magnetic relaxation via spin-phonon coupling. | | Source: | arXiv, 0810.3941 | | Services: | Forum | Review | PDF | Favorites | |
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