caa a22 4500 445380985 CHVBK 20180317143017.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-1009-0 doi (NATIONALLICENCE)springer-10.1007/s10948-010-1009-0 A Study of the Thallium- and Bismuth-based High-temperature Superconductors in the Framework of the Generalized BCS Equations [Elektronische Daten] [G. Malik, Usha Malik] Presented here in the framework of the generalized BCS equations—which are based on multiple phonon exchanges for the formation of Cooper pairs (CPs)—is continuation of a study carried out earlier for MgB2 Nb3Sn and YBCO. Addressed now are the principal members of the Tl- and Bi-based high-T c superconductors. For any of these, with the input of any two parameters from the set {critical temperature, two gaps}, and the Debye temperature, it is shown that one can calculate the remaining parameter. This is similar to what normal BCS equations achieve for a simple superconductor. Further, we show that these equations lead to upper bounds on the gap- and the T c-values of a HTSC, beyond which one must invoke 2/3-phonon mechanism for the formation of CPs. Our considerations suggest the interesting possibility that senior members of the said families of cuprates may be three-gap SCs. Springer Science+Business Media, LLC, 2010 Generalized BCS equations nationallicence Multiple phonon-exchange mechanisms nationallicence Multiple Debye temperatures nationallicence Tl-, Bi-based cuprates nationallicence Malik G. Theory Group, School of Environmental Sciences, Jawaharlal Nehru University, 110067, New Delhi, India aut Malik Usha Physics Department, Miranda House, University of Delhi, 10007, Delhi, India aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 255-260 1557-1939 24:1-2<255 2011 24 10948 https://doi.org/10.1007/s10948-010-1009-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1009-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Malik G. Theory Group, School of Environmental Sciences, Jawaharlal Nehru University, 110067, New Delhi, India aut NATIONALLICENCE 700 1- Malik Usha Physics Department, Miranda House, University of Delhi, 10007, Delhi, India aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 255-260 1557-1939 24:1-2<255 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer