论文标题
探测超导订单中的超导订单ca $ _ {x} $ y $ _ {1-x} $ ba $ _ {2} $ cu $ _ {3} $ o $ $ $ $ _ {7} $由中子
Probing superconducting order in overdoped Ca$_{x}$Y$_{1-x}$Ba$_{2}$Cu$_{3}$O$_{7}$ by neutron diffraction measurements of the vortex lattice
论文作者
论文摘要
我们提出了磁性涡旋晶格（VL）的小角度中子散射研究（ca $ _ {0.04} $ y $ $ _ {0.96} $ ba $ _ {2} $ _ {2} $ cu $ _ {3} $ o $ $ $ $ $ _ {7} $ ca $ _ {0.15} $ y $ _ {0.85} $ ba $ _ {2} $ cu $ _ {3} $ o $ $ $ _ {7} $最高可达25 t。我们发现，一系列涡流晶格结构的转换相对于未含量的vortex lattice Transition在现场转移而变化。我们将其归因于掺杂引入的疾病中Cu-O链中1-D超导性的削弱。预计钙的孔掺杂也会改变费米的速度，并降低系统的上部临界场。涡旋晶格的高视野结构与25〜T领域的母体化合物上的最新测量值相似，这表明超导间隙的基本\ textit {d} - 波性质不变。 VL形式的温度依赖性证实了这一点，VL形式的温度依赖性也显示了与其他蛋糕中观察到的相同的\ textit {d} - 波行为。我们还发现了Pauli promagnetic在VL形状因子的现场依赖性中的证据。
We present small angle neutron scattering studies of the magnetic vortex lattice (VL) in Ca$_{0.04}$Y$_{0.96}$Ba$_{2}$Cu$_{3}$O$_{7}$ up to a field of 16.7 T, and Ca$_{0.15}$Y$_{0.85}$Ba$_{2}$Cu$_{3}$O$_{7}$ up to 25 T. We find that the series of vortex lattice structure transitions have shifted down in field relative to those reported for the undoped compound. We attribute this mainly to the weakening of the 1-D superconductivity in the Cu-O chains by the disorder introduced by doping. The hole doping by calcium is also expected to alter the Fermi velocity and it reduces the upper critical field of the system. The high-field structure of the vortex lattice is similar to recent measurements on the parent compound in fields of 25~T, which indicates that the fundamental \textit{d}-wave nature of the superconducting gap is unchanged by calcium doping. This is corroborated by the temperature dependence of the VL form factor which also shows the same \textit{d}-wave behaviour as observed in other cuprates. We also find evidence of Pauli paramagnetic effects in the field dependence of the VL form factor.
