An Approach For Electrical Conduction

Asian Resonance(P: ISSN No. 0976-8602 RNI No.UPENG/2012/42622 VOL.-IV, ISSUE-II, April-2015 E: ISSN No. 2349-9443)  

Abstract

 Shiv Prasad Shriyal 

Research Scholar, Deptt. of Physics, Govt. P.G. College, Rishikesh,Uttarakhand


M. C. Badoni 

Research Scholar, Deptt. of Physics, Govt. P.G. College, Rishikesh, Uttarakhand


B. P. Bahuguna 

Associate Professor, Deptt. of Physics, Govt. P.G. College, Rishikesh, Uttarakhand

Electrical conductivity is the interaction of electron with the lattice by collision processes in which energy and momentum are exchanged. The electrical conductivity of crystals is one of the most important non-equilibrium properties, which shows that how a system relaxes to its equilibrium distribution. An electron is accelerated by the external field between two collision processes. The scattering of electrons gives rise to the electrical resistivity. The theory of electrical conductivity has been investigated with the help of quantum dynamical approach after considering the model Hamiltonian which consists of the state of a real crystal containing phonon system, electron system, localized impurities and interactions thereof. The interaction of electrons with defect induced localized phonon fields with anharmonic forces, which ultimately gives rise, resistance to electronic transport. An electron is scattered out by lattice vibration, the process is similar to which phonon interact. Consequently the potential on electron is disturbed and gives the possibility of scattering. Analysis shows that the electrical conductivity depends on a large number of scattering events and on crystal characteristics and temperatures. Static defects and thermal vibration of lattice are responsible for the scattering of electrons. Present study shows that electrical conductivity directly depends on electron-phonon scattering. Electron phonon scattering is collectively electron-electron scattering, electron-phonon scattering, cubic and quartric phonon electron scattering. The evaluation of electrical conductivity expression shows that it depends on (i) harmonic force fields (ii) localized phonon fields and (iii) Anharmonic forces. In present study it is shown that the experimental variation for electrical conductivity is similar to the theoretical curves.

for full paper please visit below link :

http://www.socialresearchfoundation.com/upoadreserchpapers/1/44/1506261114481st%20b.p.bhahugana.pdf


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