EMS172L_Lab02_Superconductivity

EMS172L_Lab02_Superconductivity - UC Davis EMS 107L...

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UC Davis – EMS 107L Electronic, Magnetic, and Optical Properties Laboratory – Prof. Ricardo Castro 1 UNIVERSITY OF CALIFORNIA, DAVIS Department of Chemical Engineering and Materials Science EMS 172L: Electronic, Magnetic, and Optical Properties Laboratory Laboratory Class II – Superconductivity We may think that superconductors are future technologies so advanced that one may see it only in science fiction movies, and delirious minds of certain professors. However, the first metallic superconductor was observed in 1911. At that time, it was observed that a certain metal showed negligible resistance under temperatures as low as 4.2K (observed by chance during a helium compression experiment). With these amazing properties, the scientific community started to dedicate to increase the temperature of operation. However, it was not before 1986 that some IBM’s researchers discovered that perovskites were superconductor at about 35K (Nobel Prize) and in 1987 other perovskite worked at 90K. These superconductors with relatively high operation temperatures are now called: High temperature Superconductor, High Tc Superconductor or HTS. HTS is really technologically interesting since allows the usage of liquid nitrogen (cheaper, easier to deal) to operate. The phenomenon of superconductivity can be explained by the formation of Cooper Pairs. That is, instead of being transported in the structure as single particles (as in metallic
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EMS172L_Lab02_Superconductivity - UC Davis EMS 107L...

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