2003/08/31 by G. Boutis, G. S. Boutis, D. Greenbaum +6 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Anisotropy #Condensed matter physics #Diffraction #Diffusion #Dipole #Magnetic field #NMR spectroscopy and applications #Order (exchange) #Physics #Quantum mechanics #Reciprocal lattice #Solid-state spectroscopy and crystallography #Spin (aerodynamics) #Spin diffusion #Zeeman effect #cond-mat
paper · pdf · doi:10.1103/physrevlett.92.137201
published as Phys. Rev. Lett., vol 92, article 137201 (2004) · 4 pages, 2 figures. Resubmitted to PRL - new figure added / discussion expanded
arxiv created 2003/12/08 · openalex publication_date 2004/03/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Reciprocal space measurements of spin diffusion in a single crystal of calcium fluoride (CaF2) have been extended to dipolar ordered states. The experimental results for the component of the spin diffusion rate parallel to the external field are DD^\ensuremath∥=29\ifmmode±\else\textpm\fi3\ifmmode×\else\texttimes\fi10^\ensuremath-12 cm2/s for the [001] direction and DD^\ensuremath∥=33\ifmmode±\else\textpm\fi4\ifmmode×\else\texttimes\fi10^\ensuremath-12 cm2/s for the [111] direction. The measured diffusion rates for dipolar order are faster than those for Zeeman order and are considerably faster than predicted by simple theoretical models. It is suggested that constructive interference in the transport of the two-spin states is responsible for this enhancement. As expected, the anisotropy in the diffusion rates is observed to be significantly less for dipolar order compared to the Zeeman case.