Electron –Phonon Interacitions and its Role in High-T C Superconductivity
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Date
1989-06
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Addis Ababa University
Abstract
'l'he electf.'on ··phonon interaction bar; ed on the harm::>nic
approx.imati.on for phonons is discussed by considering several
physical. models. Some consequences of t.his interaction I such
as the possibility of cooper pairing and the BCS theory of
superconductiv:lty are described.
T\'IO proposed mechanisms of High-T
c
superconductivity
both based on the electron-ion interaction of electron pairing
are discussed. II 2D BCS model results the observed values of
Tand the absence of the isotope effect in its conventional c
form. Another model based on the non harmonic double-well
potentials in the cu-o chain in YBCO is also studied. A
qualitative prediction of the effect of pressure on Tc and the
smallness of the critical current is made
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Keywords
Electron –Phonon Interacitions