论文标题
为什么超级流体密度跟踪$ t _ {\ rm c} $在丘比特超导体中？
Why the superfluid density tracks $T_{\rm c}$ in cuprate superconductors?
论文作者
论文摘要
关于超导（SC）密度$ n _ {\ rm sc} $的第一个发现之一是它们的小幅度，揭示了相位波动的重要性。最近，多种库酸酯的测量值表明，随着掺杂的增加，它也比BCS理论的预期要小得多，并顺利下降至零。我们通过电子相分离理论用Ginzburg-landau潜在的$ V _ {\ rm gl} $解释了这些观察结果，该$ v _ {\ rm gl} $产生了交替的电荷域，其波动会导致由约瑟夫森耦合$ e _ {\ rm j j} $ josephson连接的本地化SC订单参数。平均$ {\ left <e _ {\ rm j}（p，t）\ right>} $与本地超级流体相位刚度$ρ_ {\ rm sc} \ propto n _ {\ rm sc} $成比例。由于$ v _ {\ rm gl} $的削弱，凝结载体的分数在超过的区域中减少。结果与$ρ_ {\ rm sc}（p）$ vs. $ t _ {\ rm c}（p）$和类似Drude的峰值测量结果一致。
One of the first finding concerning the superconducting (SC) density $n_{\rm sc}$ in cuprates was their small magnitudes that revealed the importance of phase fluctuations. More recently, measurements in a variety of overdoped cuprates indicate that it is also much smaller than expected from BCS theories and falls smoothly to zero as doping is increased. We explain these observations by an electronic phase separation theory with a Ginzburg-Landau potential $V_{\rm GL}$ that produces alternating charge domains whose fluctuations lead to localized SC order parameters that are connected by Josephson coupling $E_{\rm J}$. The average ${\left <E_{\rm J}( p,T)\right>}$ is proportional to the local superfluid phase stiffness $ρ_{\rm sc} \propto n_{\rm sc}$. The fraction of condensed carriers decreases in the overdoped region due to the weakening of $V_{\rm GL}$. The results agreed with $ρ_{\rm sc}(p)$ vs. $T_{\rm c}(p)$ and the Drude-like peak measurements.
