Abstract
We estimated the ratios of 63Cu hyperfine coupling constants in the double-layer high-Tc superconductor HgBa2CaCu2O6+δ from the anisotropies in Cu nuclear spin-lattice relaxation rates and spin Knight shifts to study the nature of the ultraslow fluctuations causing the T2 anomaly in the Cu nuclear spin-echo decay. The ultraslow fluctuations may come from uniform magnetic fluctuations spread around the wave vector q = 0, otherwise the electric origins.
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