Journal
PHYSICAL REVIEW B
Volume 86, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.174403
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We have studied the low-energy spin dynamics between 4.6 and 0.07 K in a Tb2Ti2O7 single-crystal sample by means of inelastic neutron scattering experiments. The spectra consist in a dual response, with a static and an inelastic contribution, showing striking Q dependencies. We propose an interpretation involving an anisotropic exchange interaction in combination with a breaking of the threefold symmetry at the rare earth site. Simulations of the Q-dependent scattering in the random phase approximation account well for the inelastic response.
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