Abstract
We used NMR to probe the uniform (wave vector ) electron spin excitations up to 800 K in and separate the from the staggered components. Our results support the logarithmic decrease of the uniform spin susceptibility below , where . From measurement of the dynamical spin susceptibility for by the spin-lattice relaxation rate , we demonstrate that the mode of spin transport is ballistic at the limit, but has a diffusion-like contribution at finite temperatures even for .
- Received 17 August 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.247202
©2001 American Physical Society