physics presentation superconductors
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K. Onnes discovered the phenomenon of superconductivity in 1911 when he observed that the electrical resistance of mercury disappeared entirely when cooled below 4.2K. He was awarded the Nobel Prize in 1913 for this discovery. A material is considered a superconductor when cooled below its critical temperature, at which point it loses all electrical resistance. Other key aspects of superconductors include their behavior in magnetic fields, as described by the Meissner effect, and theories like the BCS theory to explain the microscopic mechanism of superconductivity. High-temperature superconductors were later discovered in 1986 by Bednorz and Muller that could superconduct above 30K, earning them a Nobel Prize. Superconductors have applications in areas
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The uploader doesn't own any rights on the contents of this presentation file. Most of the contents are from www.wikipedia.org
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The uploader doesn't own any rights on the contents of this presentation file. Most of the contents are from www.wikipedia.org
Feel free to share this presentation file under Creative Commons license "Attribution-NonCommercial-ShareAlike"
(CC BY-NC-SA)
Thanks
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𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
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- 1. SUPERCONDUCTORS PHENOMENON DISCOVERED BY K. ONNES IN 1911. AND HE HAD WON NOBEL PRIZE FOR THIS INVENTION IN 1913.
- 2. ACCORDING TO HIM "WHEN A MATERIAL IS COOLED BELOW A SPECIFIED TEMPERATURE IT TOTALLY LOOSES ITS PROPERTY OF RESISTANCE AND BECOME A SUPERCONDUCTOR". THIS SPECIFIED TEMPERATURE IS KNOWN AS CRITICAL TEMPERATURE AT WHICH A MATERIAL TURNS INTO A SUPERCONDUCTOR.
- 3. TEMPERATURE DEPENDENCE OF RESISTIVITY IN SUPERCONDUCTING MATERIAL-:
- 5. EFFECT OF MAGNETIC FIELD-: IN 1913 K. ONNES OBSERVED THAT SUPERCONDUCTIVITY IS DESTROYED IF A SUFFICIENT STRONG MAGNETIC FIELD IS APPLIED. THE MINIMUM MAGNETIC FIELD WHICH IS NECESSARY TO REGAIN ITS NORMAL STATE IS CALLED CRITICAL MAGNFIELD.
- 8. IN 1933 MEISSNER OBSERVED THAT IF A SUPERCONDUCTOR IS COOLED BELOW CRITICAL TEMPERATURE CORRESPONDING TO THAT FIELD, THEN LINES OF INDUCTION ARE EXPELLED FROM THE MATERIAL . AND THIS EFFECT IS NAMED AS MEISSNER EFFECT.
- 9. BCS THEORY (explanation of superconductivity)-: IN 1957 BARDEEN COOPER AND SCRIEFFER GAVE A THEORY TO EXPLAIN SUPERCONDUCTIVITY NAMED AS BCS THEORY SHOWS LATTICE DISTORTION
- 10. ELECTRON-LATTICE-ELECTRON INTERACTION VIA A PHOTON FIELD
- 11. HIGH TEMPERATURE SUPERCONDUCTORS-: IN 1986 BEDNORZ AND ALEX MULLER DISCOVERED THE HIGH TEMPERATURE SUPERCONDUCTIVITY IN CERAMICS AND THEY WERE AWARDED THE NOBEL PRIZE IN PHYSICS IN 1987 THEY MADE A PARTICULAR TYPE OF CERAMIC MATERIAL WHICH REMAINED A SUPERCONDUCTOR AT A TEMPERATURE AS HIGH AS 30 K. EXAMPLES OF HIGH TEMPERATURE
- 13. APPLICATIONS OF SUPERCONDUCTORS (1) POWER TRANSMISSION (2)SUPERCONDUCTING MAGNETS (3) FOR PROGRESS OF COMPUTER TECHNOLOGY (4) SUPERCONDUCTING QUANTUM INTERFERENCE DEVICES (SQUIDS) (5) VERY STRONG MAGNETIC FIELD