超导体/铁磁体纳米复合材料的双逾渗相变
Double Percolation Transition in Superconductor/Ferromagnet Nanocomposites
摘要：
在由二硼化镁超导体和氧化铬半金属铁磁体纳米颗粒组成的二元网络中发现了双逾渗相变。在两个不同的渗流阈值之间，观察到异常高电阻或绝缘状态，与任一组分的单组分系统中的导电或超导状态相比。这种双逾渗效应，这是特别明显的液氦温度下，是由复合材料的体积分数控制，并源于抑制界面传导和不同种类的纳米粒子之间的隧道。我们调查的标度行为附近的逾渗阈值，并确定不同的临界指数与两种不同类型的过渡。
英文摘要：
A double percolation transition is identified in a binary network composed of nanoparticles of magnesium diborade superconductor and chromium oxide half-metallic ferromagnet. Anomalously high-resistance or insulating state, as compared to the conducting or superconducting states in single-component systems of either constituent, is observed between two distinct percolation thresholds. This double percolation effect, which is especially pronounced at liquid helium temperatures, is controlled by composite volume fraction and originates from the suppressed interface conduction and tunneling between nanoparticles of different species. We investigate the scaling behavior near both percolation thresholds, and determine the distinct critical exponents associated with two different types of transitions.
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