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We report inelastic neutron scattering measurements of low energy ($\hbar\omega < 10$ meV) magnetic excitations in the "11" systemFe$_{1+y}$Te$_{1-x}$Se$_{x}$. The spin correlations are two-dimensional (2D) inthe superconducting samples at low temperature, but appear much morethree-dimensional when the temperature rises well above $T_c \sim 15$ K, with aclear increase of the (dynamic) spin correlation length perpendicular to the Feplanes. The spontaneous change of dynamic spin correlations from 2D to 3D onwarming is unexpected and cannot be naturally explained when only the spindegree of freedom is considered. Our results suggest that the low temperaturephysics in the "11" system, in particular the evolution of low energy spinexcitations towards %better satisfying the nesting condition for mediatingsuperconducting pairing, is driven by changes in orbital correlations.

physical review. b./physical review. b

Unexpected Enhancement of Three-Dimensional Low-Energy Spin Correlations  in Quasi-Two-Dimensional Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ System at High  Temperature