Bulk charge thickness modulations, recently noticed in high critical-temperature (Tc) cuprate superconductors, coexist with the so-called pseudogap and contend with superconductivity. But its direct observance is restricted to a narrow doping region inside underdoped regime. Using energy-resolved resonant x-ray scattering we now have discovered proof for these types of bulk charge modulations, or soft collective fee settings (soft CCMs), in optimally doped Bi1.5Pb0.6Sr1.54CaCu2O8+δ (Pb-Bi2212) round the summit of this superconducting dome with energy transfer q∥∼0.28 mutual lattice units (r.l.u.) across the Cu-O bond direction. The signal is stronger at T≃Tc than at reduced conditions, therefore verifying a competition between soft CCMs and superconductivity. These outcomes prove that smooth CCMs aren't constrained to the underdoped regime, suggesting that soft CCMs appear across a large part of the period drawing of cuprates and are intimately entangled with high-Tc superconductivity.
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