Weak three-dimensional coupling of Heisenberg quantum spin chains in SrCuTe2O6

The magnetic Hamiltonian of the Heisenberg quantum antiferromagnet SrCuTe_{2}_{6}is studied by inelastic neutron scattering technique on powder and single crystalline samples above and below the magnetic transition temperatures at 8 K and 2 K. The high temperature spectra reveal a characteristic diffuse scattering corresponding to a multi-spinon continuum confirming the dominant quantum spin-chain behavior due to the third neighbour...