蜂窝晶格上阻挫约瑟夫森结阵列的电阻转变
Resistive transition in frustrated Josephson-junction arrays on a honeycomb lattice
摘要：
我们用蒙特卡罗动力学方法研究了蜂窝晶格上超导约瑟夫森结阵列在磁场中的电阻行为，磁场对应于每个格元的$f$通量量子。而对于$f=1/3$的零电阻的开始被发现在非零温度，对于$f=1/2$的结果是一致的过渡的情况下，临界温度消失，线性电阻率显示热激活行为。通过对非线性电阻率的动态标度分析，确定了$f=1/2$零温转变的热临界指数。的电阻行为同意最近的结果，从相关长度的计算和实验观察超薄超导薄膜与纳米孔的三角形图案的相位相干过渡。
英文摘要：
We use driven Monte Carlo dynamics to study the resistive behavior of superconducting Josephson junction arrays on a honeycomb lattice in a magnetic field corresponding to $f$ flux quantum per plaquette. While for $f=1/3$ the onset of zero resistance is found at nonzero temperature, for $f=1/2$ the results are consistent with a transition scenario where the critical temperature vanishes and the linear resistivity shows thermally activated behavior. We determine the thermal critical exponent of the zero-temperature transition for $f=1/2$, from a dynamic scaling analysis of the nonlinear resistivity. The resistive behavior agrees with recent results obtained for the phase-coherence transition from correlation length calculations and with experimental observations on ultra-thin superconducting films with a triangular pattern of nanoholes.
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