%0 Journal Article
%T 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
%A Ece Uykur
%A Kiyohisa Tanaka
%A Takahiko Masui
%A Shigeki Miyasaka
%A Setsuko Tajima
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevLett.112.127003
%X 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}$.
%U http://arxiv.org/abs/1403.4092v1