Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev Lett. 2010 Jul 16;105(3):037006. doi: 10.1103/PhysRevLett.105.037006.
A Ginzburg-Landau approach to fluctuations of a layered superconductor in a magnetic field is used to show that the interlayer coupling can be incorporated within an interacting self-consistent theory of a single layer, in the limit of a large number of neighboring layers. The theory exhibits two phase transitions-a vortex liquid-to-solid transition is followed by a Bose-Einstein condensation into the Abrikosov lattice-illustrating the essential role of interlayer coupling. By using this theory, explicit expressions for magnetization, specific heat, and fluctuation conductivity are derived. We compare our results with recent experimental data on the iron-pnictide superconductors.
采用金兹堡-朗道方法研究磁场中多层超导体的涨落，结果表明，在大量相邻层的极限条件下，层间耦合可以纳入单层相互作用的自洽理论中。该理论表现出两个相变——涡旋液-固相变之后是玻色-爱因斯坦凝聚到阿布里科索夫晶格——说明了层间耦合的重要作用。通过使用该理论，我们推导出了磁化强度、比热和涨落电导率的显式表达式。我们将结果与铁-磷化物超导体的最新实验数据进行了比较。
