Demonstration apparatus for high-temperature superconduction zero resistance phenomenon
A technology of high-temperature superconductivity and demonstration device, applied in the field of teaching instruments, can solve the problems of long time and expensive equipment.
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Embodiment 1
[0020] The sintered YBa 2 Cu 3 o y The superconducting disc is cut into semicircles and the surface is cleaned. Make four electrical contacts on one side of the superconducting sample with metal indium. Because In has a low melting point, soft texture, and can be deformed with a little pressure, In is selected as the electrical contact material of the four-lead sample. Four contacts are lined up on one side of the oxide superconducting sample by means of pressure, and the contacts are separated from each other. Then use In to connect the 4 thin wires to the 4 contacts respectively by crimping to form a four-lead sample. The morphology of the four-lead sample is as follows image 3 , the two wires at both ends are current leads, and the two middle wires are voltage leads. Connect the sample with four leads to the corresponding contacts on the sample holder by soldering. In order to obtain good thermal conductivity, the four-lead sample should be attached to the metal pla...
Embodiment 2
[0025] The same method as in Example 1 was used to make a superconducting sample and load a current. When the voltage shows stability, the sample rod is directly inserted into the liquid nitrogen, that is, the superconducting sample is directly immersed in the liquid nitrogen. The sample temperature rapidly dropped from room temperature (about 300K) to liquid nitrogen temperature (77K). Thanks to YBa 2 Cu 3 o y The critical transition temperature of the superconducting sample is about 90K, and the voltage on the sample rapidly changes from 0.232mV at room temperature to zero. The cooling process is completed within half a minute.
Embodiment 3
[0027] Cut the melt-textured sample into a shape about 10 mm long, 4 mm wide and 1 mm thick, and cover most of the sample plane with aluminum foil, leaving only 4 joint areas separated from each other. Using silver (Ag) or gold (Au) as the target material, four electrical contacts are made on the sample by magnetron sputtering. Use Ag glue to bond four leads on the joints to make a four-lead sample. Connect the sample with four leads to the corresponding contacts on the sample holder by soldering. In order to obtain good thermal conductivity, the four-lead sample should be attached to the metal plate part of the sample holder.
[0028] Connect the test rod to the host of the demonstrator. Turn on the power of the demonstration instrument, adjust the constant current to about 30mA, and the digital tube under the instrument shows that the current loaded on the superconducting sample is 30.02mA. At the same time, the digital tube above shows that the voltage on the sample at r...
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