Superconductive behavior of a multiconnected Josephson network in a periodically varying magnetic field of two frequency components

摘要

In a mixing magnetic field ofh1 sin 2pgr;f1tandh2 sin 2pgr;f2t, the ac fundamental susceptibility khgr;1=khgr;′1−ikhgr;″1of a microbridge‐coupled Tc specimen has been studied through frequency channels off1andf2. It has been revealed thath1 sin 2pgr;f1tandh2 sin 2pgr;f2tdo not independently contribute to khgr;1, wheref1is 35 Hz;f2is 45 Hz, andh1fixed at 14.6 mOe. As expected, thef2‐channel response khgr;1(f2) is sensitive toh2. Thef1‐channel response khgr;1(f1) also depends onh2, but its behavior is unusual compared to khgr;1(f2). We develop the numerical calculation of khgr;′1(f1), khgr;″1(f1), khgr;′1(f2), and khgr;″1(f2) by using our phenomenological model. Generated profiles give a fine explanation to observed results.