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A frequency mixing and phase locking system is designed, in which electromagnetic shielding, microwave coupling, and intermediate frequency (IF) measurement arrangements are included. In lieu of liquid nitrogen, a pulse tube cryocooler is used to cool the whole system. With Josephson grain boundary junction as the mixing element, the 96th harmonic frequency mixing at 3 mm waveband is obtained, and...
Several types of quasi-particle injections into YBa2Cu3O7−δ (YBCO) micro-bridge have been studied, revealing the quasi-particle non-equilibrium effect, the current superposition effect and the heating effect. The current gain’s dependence on temperatures indicates that superconductivity of YBCO is really suppressed by quasi-particle injection. We propose a new type of quasi-particle injection which...
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