Overview of spectroscopies I (MC) - TDDFT.org
Overview of spectroscopies I (MC) - TDDFT.org
Overview of spectroscopies I (MC) - TDDFT.org
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Estimate <strong>of</strong> the critical temperature T cAlthough no measurements <strong>of</strong> isotope effect on T c available yet,because <strong>of</strong> strong electron-phonon interaction we conjecture that thesuperconductivity mechanism is BCS-like, Cooper pairs glued byphonons.●McMillan equation:●1 12 2TcTDexp{ [ (1 ) *] ; =NdD / MDWhere is the hole-phonon coupling constant and * represents thehole-hole Coulomb repulsion. N d is the density <strong>of</strong> hole at the FermiLevel, T d and d the “Debye” temperature and frequency, resp. and Dan average hole-phonon deformation potential. Taking standard values<strong>of</strong> these parameters from the literature and assuming * 0we obtained (M.Cardona,Solid State Com. 133,(2005),3) T c 5.2 K.For hole concentration N h = 2.2x10 21 cm -3 . .19
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