Ultraslow fluctuations in the pseudogap states of HgBa$_{2}$CaCu$_{2}$O$_{6+d}$

We report the transverse relaxation rates 1/ $T_{2}$ ’s of the $^{63}$ Cu nuclear spin-echo envelope for double-layer high- $T_{c}$ cuprate superconductors HgBa $_{2}$ CaCu $_{2}$ O $_{6 + d}$ from underdoped to overdoped. The relaxation rate 1/ $T_{2 L}$ of the exponential function (Lorentzian component) shows a peak at 220 $-$ 240 K in the underdoped ( $T_{c}$ = 103 K) and the optimally doped ( $T_{c}$ = 127 K) samples but no peak in the overdoped ( $T_{c}$ = 93 K) sample. The enhancement in 1/ $T_{2 L}$ suggests development of the zero frequency components of local field fluctuations. Ultraslow fluctuations are hidden in the pseudogap states.

Ultraslow fluctuations in the pseudogap states of HgBa $_{2}$ CaCu $_{2}$ O $_{6 + d}$

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Ultraslow fluctuations in the pseudogap states of HgBa $_{2}$ CaCu $_{2}$ O $_{6 + d}$

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Ultraslow fluctuations in the pseudogap states of HgBa22​CaCu22​O6+d6+d​

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Ultraslow fluctuations in the pseudogap states of HgBa22​CaCu22​O6+d6+d​

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Ultraslow fluctuations in the pseudogap states of HgBa $_{2}$ CaCu $_{2}$ O $_{6 + d}$

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Ultraslow fluctuations in the pseudogap states of HgBa $_{2}$ CaCu $_{2}$ O $_{6 + d}$

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