Ultraslow fluctuations in the pseudogap states of HgBa${}_2$CaCu${}_2$O${}_{6+d}$

Abstract

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/$T_{2L}$ 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/$T_{2L}$ suggests development of the zero frequency components of local field fluctuations. Ultraslow fluctuations are hidden in the pseudogap states.

arXiv comment6 pages, 6 figures

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Cited by in corpus (4)

• Orientation of the intra-unit-cell magnetic moment in the high-Tc superconductor HgBa2CuO${}_{4+\delta }$
• Incipient loop current order in the under-doped cuprate superconductors
• Cu hyperfine coupling constants of HgBa${}_2$Ca​Cu${}_2$O${}_{6+\delta }$
• Hidden Universal Metal in Cuprate Superconductors