TERM PAPER OF physics zaffar

TERM PAPER OF physics zaffar - TERMPAPEROF PHY111...

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  TERM PAPER OF  PHY-111 TOPIC: Superconductivity                                                                        SUBMITTED ON: 30/03/2011 SUBMITTED BY:                                               SUBMITTED TO:
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NAME: Zaffar iqbal   UMA kamboj  SECTION:M5001 ROLL NO.:B-47 REG. NO.: 11007823 e-mail id:zaffariqbal9@gmail.com ACKNOWLEDGEMENT I would first like to thank my physics teacher Ms.Uma Kamboj Madam , for his tremendous support and contribution from time to time in giving me several information and data related to this term paper Topic Superconductivity Zaffar iqbal B. Tech LIT (CIVIL) 2ndSem.
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Contents:- 1- Superconductivity 2- Classification 3- Elementary properties of superconductors 4- Meissner effect 5- London moment 6- Theories of superconductivity 7- History of superconductivity 8- High temperature superconductivity 9- YBCO superconductor’s 10- Preparation of high-Tc superconductors 11- Application’s 12- Resources
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Superconductivity Superconductivity is an electrical resistance of exactly zero which occurs in certain materials below a characteristic temperature . It was discovered by Heike Kamerlingh Onnes on April, 8, 1911 in Leiden . Like ferromagnetism and atomic spectral lines , superconductivity is a quantum mechanical phenomenon. It is also characterized by a phenomenon called the Meissner effect , the ejection of any sufficiently weak magnetic field from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics . The electrical resistivity of a metallic conductor decreases gradually as the temperature is lowered. However, in ordinary conductors such as copper and silver , this decrease is limited by impurities and other defects. Even near absolute zero , a real sample of copper shows some resistance. Despite these imperfections, in a superconductor the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing in a loop of superconducting wire can persist indefinitely with no power source. In 1986, it was discovered that some cuprate - perovskite ceramic materials have critical temperatures above 90 K (−183 °C). These high-temperature superconductors renewed interest in the topic because of the prospects for improvement and potential room-temperature superconductivity. From a practical perspective, even 90 K is relatively easy to reach with readily available liquid nitrogen (which has a boiling point of 77 K), resulting in more experiments and applications. A
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TERM PAPER OF physics zaffar - TERMPAPEROF PHY111...

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