LOW RESISTANCE CURRENT LEAD AND LOW RESISTANCE CURRENT LEAD UNIT

PURPOSE:To restrain the entry of heat into an extremely low temperature part by using silver or silver alloy for longitudinally bonding at least two current leads, which are made of oxide superconductors, and heating and melting it under a pressurized oxygen atmosphere so that the current lead is freely bendable. CONSTITUTION:By utilizing the property of silver that when heated under an oxygen pressure atmosphere it has a lower melting point than that of an oxide superconductor, many superconductors, if short, are longitudinally connected together with silver used as bond. In this way, of current leads of optional length can be obtained with reasonable curvature as a whole because silver is more flexible than the superconductor to allow external force in bending- direction to be absorbed at the bonded parts. Silver is used exactly only as bond and the main part of the lead is therefore made of a low heat conductivity conductor to block heat conduction at the conductor part and prevent the entry of heat. Concretely a lead 1 is made up with units 2a- and bonded parts 3a- provided with electrifying area enlarged portions 4a-.