OBSERVATION OF ANTIFERROMAGNETIC ORDER IN YBa2Cu3O6.15 by CU NQR

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Abstract
The NQR spectra of YBa2Cu3Oy (6.0 < y < 6.25) show two different antiferromagnetic structures with a different stacking sequence. In both structures the magnetic moment is located at the Cu-2 sites perpendicular to the c-axis. The structure with antiferromagnetic coupling between all Cu-2 planes reveals strong temperature dependent magnetic fluctuations with correlation times of about 10-6 s at 15 K. No fluctuations are found in the second structure which reveals a constant internal field of about 0.2 T

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