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Electron-spin-echo experiments on the one-dimensional conductor [ ( fluoranthene ) 2 ] + <mml:…

1983; American Physical Society; Volume: 27; Issue: 9 Linguagem: Inglês

10.1103/physrevb.27.5366

1095-3795

J. Sigg, Thomas F. Prisner, Klaus‐Peter Dinse, H. Brunner, D. Schweitzer, Karl H. Hausser,

Magnetism in coordination complexes

The electron-spin-echo decay function was determined for the conducting phase of ${[{({\mathrm{C}}_{16}{\mathrm{H}}_{10})}_{2}]}^{+}{X}^{\ensuremath{-}}$ in the temperature range 183-300 K. The decay function exhibited an $\mathrm{exp}[\ensuremath{-}{(\ensuremath{\gamma}t)}^{\frac{3}{2}}]$ dependence, characteristic of one-dimensional spin diffusion. The ratio $5\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\le}\frac{{D}_{\ensuremath{\parallel}}}{{D}_{\ensuremath{\perp}}}\ensuremath{\le}5\ifmmode\times\else\texttimes\fi{}{10}^{8}$ for the inner-stack---to---out-of-stack diffusion rates was determined from the characteristic time ${t}_{0}$, at which the electron-spin-echo decay function changed to the "conventional" $\mathrm{exp}(\ensuremath{-}2{\ensuremath{\gamma}}^{\ensuremath{'}}\ensuremath{\tau})$) form. The deduced value $2\ifmmode\times\else\texttimes\fi{}{10}^{13}\ensuremath{\le}{D}_{\ensuremath{\parallel}}\ensuremath{\le}2\ifmmode\times\else\texttimes\fi{}{10}^{16}$ rad/s is consistent with the bulk dc conductivity and with recently determined nuclear spin-lattice relaxation rates. The overall assumption of highly mobile electronic spins was confirmed by an Overhauser-type experiment.