Structural distortion and the spin liquid state in Tb2Ti2O7

Details Structural distortion and the spin liquid state in Tb2Ti2O7 Structural distortion and the spin liquid state in Tb2Ti2O7

2007-12-11

arxiv.org/abs/0712.1703v2

Phys. Rev. B 78, 094418 (2008)

Physics

Condensed Matter

Materials Science

5 pages

Scientific paper

10.1103/PhysRevB.78.094418

It is shown that a k=0, A_{2u} distortion of the terbium tetrahedral network in Tb2Ti2O7 accounts for the apparent isolation of single tetrahedra as seen in neutron scattering studies. Single tetrahedron collective spin states, rather than individual spins, account for the main features of the spin liquid state, namely, fluctuating local moments and the absence of long range order. Singlet and doublet collective spin ground states are considered. An effective interaction between tetrahedra on the fcc lattice is derived and found to be weak and anisotropic.

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