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arXiv 1003.0648cond-mat.supr-con
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Ⅰ型Ginzburg-Landau超导体薄膜中的简单涡旋态

Simple Vortex States in Films of Type-I Ginzburg-Landau Superconductor

Mark C. Sweeney, Martin P. Gelfand

摘要:

在垂直磁场中,足够薄的I型超导体薄膜呈现三角形涡旋晶格,而厚的薄膜则呈现中间态。为了阐明这两个制度之间发生了什么,精确的数值计算已经在Ginzburg-Landau理论在$κ=0.5$和0.25的各种涡旋晶格结构与一个通量量子每单元格。在平均感应和膜厚度的空间中的相图包括窄楔形,其中正方形晶格是稳定的,由三角形晶格在较薄的膜/较低的场的稳定域包围,并且在另一侧,具有连续变化的纵横比的矩形晶格。涡旋晶格在正方形晶格相内和接近正方形晶格相处具有非常小的剪切模量。

英文摘要:

Sufficiently thin films of type-I superconductor in a perpendicular magnetic field exhibit a triangular vortex lattice, while thick films develop an intermediate state. To elucidate what happens between these two regimes, precise numerical calculations have been made within Ginzburg-Landau theory at $κ=0.5$ and 0.25 for a variety of vortex lattice structures with one flux quantum per unit cell. The phase diagram in the space of mean induction and film thickness includes a narrow wedge in which a square lattice is stable, surrounded by the domain of stability of the triangular lattice at thinner films/lower fields and, on the other side, rectangular lattices with continuously varying aspect ratio. The vortex lattice has an anomalously small shear modulus within and close to the square lattice phase.

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