平面缺陷对磁通线的钉扎
Pinning of Flux Lines by Planar Defects
摘要：
研究了随机分布的点杂质和面缺陷对第二类超导体及相关系统中有序和输运的影响。结果表明，布拉格玻璃相是不稳定的平面效应。即使单个弱缺陷平面平行于磁场以及Abrikosov磁通线晶格的主轴之一取向，也是布拉格玻璃中的相关扰动。与磁场对准的缺陷恢复通量密度振荡，该通量密度振荡随着距缺陷的距离代数地衰减。该理论与含有冻结杂质的Luttinger液体的物理学有着惊人的相似之处。导出了垂直于缺陷方向的磁通线蠕变指数。我们发现，磁通线晶格中存在许多随机分布的平行平面缺陷对齐的磁场一个新的玻璃相，我们称之为平面玻璃。平面玻璃的特征在于发散的剪切和倾斜模量、横向迈斯纳效应、抗剪切变形。我们还得到样品样品的纵向磁化率的波动和指数衰减的平移长程序在垂直于缺陷的方向。垂直于缺陷的磁通蠕动导致非线性电阻率$ρ(J \to 0)\sim \exp[-(J_D/J)^{3/2}]$。强的平面缺陷迫使位错阵列位于与伯格斯矢量平行的缺陷，以放松剪切应变的缺陷。
英文摘要：
The influence of randomly distributed point impurities and planar defects on order and transport in type-II superconductors and related systems is studied. It is shown that the Bragg glass phase is unstable with respect to planar efects. Even a single weak defect plane oriented parallel to the magnetic field as well as to one of the main axis of the Abrikosov flux line lattice is a relevant perturbation in the Bragg glass. A defect that is aligned with the magnetic field restores the flux density oscillations which decay algebraically with the distance from the defect. The theory exhibits striking similarities to the physics of a Luttinger liquid with a frozen impurity. The exponent for the flux line creep in the direction perpendicular to a relevant defect is derived. We find that the flux line lattice exhibits in the presence of many randomly distributed parallel planar defects aligned to the magnetic field a new glassy phase which we call planar glass. The planar glass is characterized by diverging shear and tilt moduli, a transverse Meissner effect, resistance against shear deformations. We also obtain sample to sample fluctuations of the longitudinal magnetic susceptibility and an exponential decay of translational long range order in the direction perpendicular to the defects. The flux creep perpendicular to the defects leads to a nonlinear resistivity $ρ(J \to 0)\sim \exp[-(J_D/J)^{3/2}]$. Strong planar defects enforce arrays of dislocations that are located at the defects with a Burgers vector parallel to the defects in order to relax shear strain.
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