论文标题
电子辐照对$ yba_2cu_3o_ {7-Δ} $单晶的波动电导率和伪gap的影响
Influence of electron irradiation on fluctuation conductivity and pseudogap in $YBa_2Cu_3O_{7-δ}$ single crystals
论文作者
论文摘要
已经研究了电子辐照能量为2.5 MeV的影响对最佳掺杂$ YBA_2CU_3O_ {7-δ} $单晶电阻率的温度依赖性的影响。在本地对模型中计算了两个波动电导率的温度依赖性$σ^\ prime（t）$和pseudoGap $δ^*（t）$对辐照剂量$ ϕ $的温度依赖性。在这里，我们表明，随着$ ϕ $的增加，$ρ（300 k）$的值增加了线性的增加，而$ t_c $线性降低。同时，$ρ{100 k} $的值增加了非线性，以$ ϕ_3 $ = 4.3 $ = 4.3 10 $^{18} $ e/$ e/$ cm^2 $的功能，也可以在其他剂量依赖性参数的数量中观察到无剂量的无剂量。 $σ^\ prime（t）$遵守Aslamazov $ - $ Larkin和Maki $ - $ THOMPSON的经典波动理论，展示了3D $ - $ 2D的交叉，随着温度的升高。交叉温度$ t_0 $使确定沿$ c $轴的连贯长度，$ξ_c（t）$，在照射下增加了$ \ 3 $乘以增加3美元。此外，高于$ t_c $的超导波动的范围也很明显增加。在$ ϕ $ = 0，依赖性$δ^*（t）$典型的单晶体中，含有明显的双重界限的单晶，最大值为$ t_ {pair} $ 〜120 k {pair} $ 〜120 k，在$ 〜120 k和$ 〜120 k的最大值，$ 〜120 k，$ t =首次确定在$ ϕ_3 $ = 4.3 10 $^{18} $ $δ^*（t）$的形状强烈变化，并且与最佳掺杂$ yba_2cu_3o_ {7-Δ} $单晶的最佳掺杂$ yba_2cu_3o_ {7-Δ} $ pseudogap开放温度$ t^*$ t^*$ t^*$ t $ $ t_c（ϕ）$没有奇异性。
The effect of electron irradiation with the energy of 2.5 MeV on the temperature dependences of the resistivity of an optimally doped $YBa_2Cu_3O_{7-δ}$ single crystal has been studied. The temperature dependences of both fluctuation conductivity $σ^\prime(T)$ and the pseudogap $Δ^*(T)$ on irradiation dose $ϕ$ have been calculated within the local pair model. Here we show that with an increase in $ϕ$, the value of $ρ(300 K)$ increases linearly, while $T_c$ decreases linearly. Concurrently, the value of $ρ{100 K}$ increases nonlinearly, demonstrating a feature for $ϕ_3$ = 4.3 10$^{18}$ e/$cm^2$, which is also observed in the number of other dose-dependent parameters.Regardless of the irradiation dose, in the temperature range from $T_c$ up to $T_{01}$, $σ^\prime(T)$ obeys the classical fluctuation theories of Aslamazov$-$Larkin and Maki$-$Thompson, demonstrating 3D$-$2D crossover with increasing temperature. The crossover temperature $T_0$ makes it possible to determine the coherence length along the $c$-axis, $ξ_c(T)$, which increases by $\approx 3$ times under irradiation. Furthermore, the range of superconducting fluctuations above $T_c$ also noticeably increases.At $ϕ$ = 0, the dependence $Δ^*(T)$ typical for single crystals containing pronounced twin boundaries is observed with a maximum at $T_{pair}$ ~ 120 K and a distinct minimum at $T = T_{01}$. It was determined for the first time that at $ϕ_3$ = 4.3 10$^{18}$ the shape of $Δ^*(T)$ changes strongly and becomes the same as in optimally doped $YBa_2Cu_3O_{7-δ}$ single crystals with a very low pseudogap opening temperature $T^*$ and noticeably reduced $T_{pair}$, while at $T_c(ϕ)$ there are no singularities.
