Copper nuclear quadrupole resonance in GdBa2Cu3O7: Determination of site assignment
Abstract
We have measured the copper nuclear relaxation rate in GdBa2Cu3O7 in zero applied field using nuclear quadrupole resonance. Fluctuations in the 4f moment associated with the gadolinium contribute strongly to the copper relaxation rate, and this contribution will depend strongly on the copper-gadolinium separation. This separation differs considerably for the two copper sites. Comparison of the relaxation rates shows that the copper signal at the higher frequency (32 MHz) originates from the Cu(2) site, which is located closer to the gadolinium than is the Cu(1) site. © 1988 The American Physical Society.
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