| 摘 要： | 1 Introduction In 1962, Josephson studied the physical phenomenon of two superconductors seperated by a thin layer of potential hill. He predicted from the point of theory that when Volt of two sides of junction is zero, there may be a superconducting current. He also thought that the critical current has a maximum J_c and regarded it due to the tunnel current of Cooper's pairs. A half year later,Anderson and Rowell proved by means of experiments that superconducting current exists in the superconducting-tunnel junction when v =0. During 1964-1965, Josephson proved again from the point of theory that the tunnel current is a sinusoidal function of
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