Phonon contribution to high-Tc superconductivity: tunneling study of slightly overdoped Bi2Sr2CaCu2O8

Nobuo Tsuda; Makoto Saitoh; Daisuke Shimada

doi:10.1117/12.452314

7 November 2002 Phonon contribution to high-T_c superconductivity: tunneling study of slightly overdoped Bi₂Sr₂CaCu₂O₈

Nobuo Tsuda, Makoto Saitoh, Daisuke Shimada

Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.452314
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Reproducibility of phonon structures in the tunneling conductance is studied by using mechanical Bi₂Sr₂CaCu₂O₈/Au contacts. The structures are much weaker than a previous clear phonon structure for a BiSr₂CaCu₂O₈/GaAs junction, and a smearing of the structures is discussed. The step-like increase in a critical temperature T_c with a number of CuO₂ layer is explained as a natural consequence of the phonon mechanism in a layered lattice. For explaining an extraordinarily large relative gap, 2Δ(0)/k_B T_c, and a T_c dependent isotope effect, an Eliashberg-magnetic pair break scenario is proposed for underdoped oxides.

Citation Download Citation

Nobuo Tsuda, Makoto Saitoh, and Daisuke Shimada "Phonon contribution to high-T_c superconductivity: tunneling study of slightly overdoped Bi₂Sr₂CaCu₂O₈", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); https://doi.org/10.1117/12.452314

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