High-Tc copper oxides as phonon-mediated strong-coupling superconductors

An Analysis of Strong Coupling in the High Tc Superconductors

“…The results of Shiina and Nakamura [13] were confirmed by analytical calculation. The results are shown in Table 1.…”

“…International Journal of Superconductivity authors [11][12][13] and must be regarded as appropriate for this purpose, given the cubic symmetry of the CuO layers in the HTSCs that would provide reduction in attenuation within the phonon spectrum. The solution of these equations in this case would require that the interaction parameter be larger than normal and this would entail that the TDOPS be much larger than that seen before in superconductors.…”

“…This has been done by Shiina and Nakamura [13]. Fix * to unity and Tc to its value for each superconducting material and assume the coupling constant in each case will remain constant over the phonon spectrum.…”

Cluster Phase Transition in Spin Glass Systems and Mechanism of High-Tc Superconductivity

“…Most of the experiments further indicate superconductivity to be of BCS [13] type [8, 14 to 17] with singlet s-wave pairing, though s-d-wave or d-wave superconductivity has also been postulated by some people; however, these latter postulated measurements are mostly magnetic in nature and there is need of including the below discussed cluster effects in their analysis. The BCS theory, as modified by the Migdal-Eliasberg approach [18 to 20], has been applied to high-T c systems by Shiina and Nakamura [21]. We rewrite their procedure and result in a way suitable for the present paper and also describe our result relevant for the present work.…”

“…We rewrite their procedure and result in a way suitable for the present paper and also describe our result relevant for the present work. They [21] have calculated T c , for the YBa 2 Cu 3 O 7 system, versus l or S H for m * 0X1, where l 2…”