Persistence of superconducting condensate far above the critical temperature in YBa${}_2$(Cu,Zn)${}_3$O${}_y$ revealed by $c$-axis optical conductivity measurements for several Zn concentrations and carrier doping levels

Abstract

The superconductivity precursor phenomena in high temperature cuprate superconductors was studied by direct measurements of superconducting condensate with the use of the $c$-axis optical conductivity of YBa${}_2$(Cu${}_{1-x}$Zn${}_x$)${}_3$O${}_y$ for several doping levels ($p$) as well as for several Zn-concentrations. Both of the real and imaginary part of the optical conductivity clearly showed that the superconducting carriers persist up to the high temperatures $T$${}_p$ that is higher than the critical temperature $T$${}_c$ but lower than the pseudogap temperature $T$${}^{\ast }$. $T$${}_p$ increases with reducing doping level like $T$${}^{\ast }$, but decreases with Zn-substitution unlike $T$${}^{\ast }$.

Accepted for publication in Physical Review Letters

References in corpus (4)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Coexistence of the Pseudogap and the Superconducting Gap Revealed by the \textit{c}-axis Optical Study of YBa${}_2$(Cu${}_{1-x}$Zn${}_x$)${}_3$O${}_{7-\delta }$
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• Investigation of Precursor Superconducting State in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ through In-plane Optical Spectroscopy
• Specific Heat and Sound Velocity Distinguish the Relevant Competing Phase in the Pseudogap Region of High Temperature Superconductors
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Superconductivity-induced transverse plasma mode and phonon anomaly in the $c$-axis response of the bilayer compound RbCa${}_2$Fe${}_4$As${}_4$F${}_2$