论文标题
伪间隙对BI $ _2 $ SR $ _2 $ CACU $ _2 $ _2 $ o $ _ {8+δ} $单晶的伪间隙对野外诱导的动能密度的影响
Effects of the pseudo-gap on the field-induced kinetic energy density of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ single crystals
论文作者
论文摘要
我们报告了磁化实验，从该实验中，我们从几个BI $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ o $ $ $ _ {8+δ} $单晶样品的超导阶段中获得了现场诱导的动能密度，即$ e_k $。动能幅度根据伪Pseudogap在不足的极限下产生的状态的单电子密度的特征降低而变化。此外，在特定的孔密度$ p \ sim0.18 $上出现的$ e_k $的显着峰值与伪造封闭导致的Van Hove奇异性有关。我们还提取了超流体密度，$ρ_s$。我们得出的结论是，$ e_k $和$ρ_s$与pseudogap能量量表有关。该结果被理解为超导性与bi $ _2 $ sr $ _2 $ _2 $ cacu $ _2 $ _2 $ o $ _ {8+Δ} $ cuprate $ cuprate comprate化合物中的伪gap现象之间存在的证据。
We report on magnetization experiments from which we obtain the field-induced kinetic energy density, $E_k$, in the superconducting phase of several Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ single crystal samples. The kinetic energy magnitude changes according to the characteristic reduction of the single-electron density of states produced by the pseudogap in the underdoped limit. Moreover, a remarkable peak of $E_k$ occurring at the specific holes density $p\sim0.18$ is related to a van Hove singularity due to the pseudogap closure. We also extracted the superfluid density, $ρ_s$. We conclude that $E_k$ and $ρ_s$ are related to the pseudogap energy scale. This result is understood as an evidence of the coexistence between superconductivity and the pseudogap phenomenon in the Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ cuprate compound.
