Tunneling observation of phonon contribution to the Cooper pairing in high-Tc superconductors

Ryzo Aoki; Hironaru Murakami; Masamitsu Shirai; Vladimir M. Svistunov; A. I. Dyachenko; D. N. Afanassyev

doi:10.1117/12.241754

10 June 1996 Tunneling observation of phonon contribution to the Cooper pairing in high-Tc superconductors

Ryzo Aoki, Hironaru Murakami, Masamitsu Shirai, Vladimir M. Svistunov, A. I. Dyachenko, D. N. Afanassyev

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241754
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Improved tunneling spectroscopy was carried out on high-T_c BSCCO(2212) single crystal, and it provided us a reflection spectrum of the quasi-particle that mediates the strong Cooper pairing. The point contact junction enabled us to observe significant fine structure spectrum beyond the gap edge up to 0.2 eV. The spectrum peaks both in positive and negative bias ranges were found to be in a good one-to-one correspondence to the phonon density-of-states peaks at energy level $HBAR(omega) _i reported by the neutron scattering experiment. The significant peaks at higher energies could be also assigned by n(epsilon) _O + $HBAR(omega) i (n equals 0.1.2) where (epsilon) _O is the breathing mode energy. Numerical computation in terms of the Eliashberg gap equation was carried out and the electron-phonon coupling intensity function (alpha) ²F((omega) ) was elucidated. Most of the peak modes were attributed to the optical phonons due to oxygen oscillations in and around the (CuO₂)_n plane, wherein the superconducting electronic state takes place. Consequently it turns out that the breathing mode has an essential role in the high-T_c superconductivity in the perovskite type-oxides.

Citation Download Citation

Ryzo Aoki, Hironaru Murakami, Masamitsu Shirai, Vladimir M. Svistunov, A. I. Dyachenko, and D. N. Afanassyev "Tunneling observation of phonon contribution to the Cooper pairing in high-Tc superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241754

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