论文标题
最佳掺杂$ yba_2cu_3o_ {7-Δ} $薄膜的上临界场和相干长度的温度依赖性
Temperature dependence of upper critical fields and coherence lengths for optimally-doped $YBa_2Cu_3O_{7-δ}$ thin films
论文作者
论文摘要
我们报告了上临界磁场的全面比较分析$μ_{0} H_ {C2}（0）$在Ginzburg-landau和Werthamer-Helfand-Hohenberg理论中获得的最佳效率优化$ yba_2cu_3o_ {7-δ} $ thin films。对于磁场的不同方向，我们的计算给出638和153 t，以$μ__{0} h_ {c2}（0）$，h || AB和$μ_{0} H_ {C2}（0）$，H || C，分别使用$ H_ {C2}（0）$时。使用正常状态电阻率值$ρ_{n} $的50和90％标准确定，首次，第一次，$ξ_{ab}（t）$和$ξ_{c}（t）$的温度依赖性。 Ginzburg-landau 0.9 $ρ_{n} $方法给出$ξ_{ab}（0）$ = 11.8 a，$ξ_{c}（0）$ = 3.0 a，与文献数据达成很好的协议。讨论了HTSC中非常短的相干长度的含义。
We report the comprehensive comparative analysis of the upper critical magnetic fields $μ_{0}H_{c2}(0)$ obtained within Ginzburg-Landau and Werthamer-Helfand-Hohenberg theories for optimally-doped $YBa_2Cu_3O_{7-δ}$ thin films. For different orientations of the magnetic field, our calculations give 638 and 153 T for $μ_{0}H_{c2}(0)$, H || ab and $μ_{0}H_{c2}(0)$, H || c, respectively, when using $H_{c2}(0)$. For the first time, the temperature dependences of coherence lengths $ξ_{ab}(T)$ and $ξ_{c}(T)$ within proposed theories were determined using 50 and 90% criteria of the normal state resistivity value $ρ_{N}$. The Ginzburg-Landau 0.9$ρ_{N}$ approach gives $ξ_{ab}(0)$=11.8 A, and $ξ_{c}(0)$=3.0 A which are in a good agreement with literature data. The implications of very short coherence lengths in HTSCs are discussed.
