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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

机译:超导冷凝物的持久性远高于临界值   温度在YBa $ _2 $(铜,锌)$ _ 3 $ O $ _y $由$ c $ -axis optical透露   几种Zn浓度和载流子掺杂的电导率测量   水平

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摘要

The superconductivity precursor phenomena in high temperature cupratesuperconductors was studied by direct measurements of superconductingcondensate with the use of the $c$-axis optical conductivity ofYBa$_{2}$(Cu$_{1-x}$Zn$_{x}$)$_{3}$O$_{y}$ for several doping levels ($p$) aswell as for several Zn-concentrations. Both of the real and imaginary part ofthe optical conductivity clearly showed that the superconducting carrierspersist up to the high temperatures $T$$_{p}$ that is higher than the criticaltemperature $T$$_{c}$ but lower than the pseudogap temperature $T$$^{\ast}$.$T$$_{p}$ increases with reducing doping level like $T$$^{\ast}$, but decreaseswith Zn-substitution unlike $T$$^{\ast}$.
机译:通过使用YBa $ _ {2} $(Cu $ _ {1-x} $ Zn $ _ {x}的$ c $轴光导率直接测量超导冷凝物,研究了高温铜酸盐超导体中的超导前体现象。 $)$ _ {3} $ O $ _ {y} $用于几种掺杂水平($ p $)以及几种Zn浓度。光学导率的实部和虚部都清楚地表明,超导载流子一直保持到高于临界温度$ T $$ _ {c} $的高温$ T $$ _ {p} $,但低于伪间隙温度$ T $$ ^ {\ ast} $。$ T $$ _ {{}} $会随着掺杂水平的降低而增加,例如$ T $$ ^ {\ ast} $,但是与$ T $$ ^ { \ ast} $。

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