Abstract
We report NMR lineshape, spin-lattice relaxation time T 1 , and spin-spin relaxation time T 2 data at 17 MHz (8.07 T) for 89 Y in the copper-oxide spin-chain compound Ca 2+x Y 2-x Cu 5 O 10 . For x = 0, a broad, asymmetric line with width Δν 90 kHz is observed for T = 250-300 K. The spectra exhibit an appreciable average shift (ΔH/H +0.7%) and sharpen at lower temperature, possibly due to increasing intrachain ferromagnetic correlations. T 1 and T 2 decrease with decreasing temperature. The T 1 data imply a short correlation-time limit, with τ e = 3-5 x 10 -11 s. The T 2 data apparently include a contribution from dipolar interactions with copper nuclei. Relaxation time data for a doped (x=0.5) compound surprisingly show more rapid relaxation.
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