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: superconductivity

Thursday, August 14, 2008
Asked by: ram
Subject: superconductivity
Question: why cooper paired electrons are not repeling each other?
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posted by S @ 1:53 PM  
2 Comments :
  • At August 14, 2008 at 7:09 PM, Anonymous z.zain said…

    cooper pair formation is an indirect interaction,which proceeds when one electron interacts with the lattice and deforms it.a second electron sees the deformed lattice and adjusts itself to take advantage of the deformation to lower its energy.thus the second electron interacts with first electron via lattice deformation.this interaction overcomes the coulombic repulsion between the electrons and thus the net interaction is attractive.

     
  • At August 14, 2008 at 7:19 PM, Anonymous z.zain said…

    cooper pair formation can also be explained as follows ...........an electron is attracted by a positive charge at the lattice and deforms the lattice in its vicinity ,exciting a phonon that travels through the crystal.this phonon is absorbed by a second electron ,getting thus coupled to the first electron.so it is a electron-lattice-electron (electon-phonon-electron)interaction."an indirect interaction "

     

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