Author(s)

G. P. Malik^1,2

¹Present Address: B-208 Sushant Lok 1, Gurgaon, Haryana, India.
²Formerly: Theory Group, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India.

By generalizing the isotope effect for elemental superconductors (SCs) to the case of pairing in the 2-phonon exchange mechanism for composite SCs, we give here an explanation of the well-known increase in the critical temperature (T_c) of Bi₂Sr₂CaCu₂O₈ from 95 K to 110 K and of Bi₂Sr₂Ca₂Cu₃O₁₀ from 105 to 115 - 125 K when Bi and Sr in these are replaced by Tl and Ba, respectively. On this basis, we also give the estimated T_cs of some hypothetical SCs, assuming that they may be fabricated by substitutions similar to Bi → Tl and Sr → Ba.

Isotope-Like Effect, 2-Phonon Exchange Mechanism, Bi- and Tl-Based High-T_c SCs, Suggestions for New Substitutions for Further Enhancement of T_c of the Bi-Based SCs

Malik, G. (2018) On the Isotope-Like Effect for High-T_c Superconductors in the Scenario of 2-Phonon Exchange Mechanism for Pairing. World Journal of Condensed Matter Physics, 8, 109-114. doi: 10.4236/wjcmp.2018.83007.