Phonon spectra in the conductance of Andreev junctions on Bi2223 at high pressure

A softening of the high-frequency phonon modes in Bi2223 ( T c=110 K) at high pressure is found. These modes correspond to the oxygen breathing mode and also the Cu–O bending modes. Qualitatively, the result obtained explains the observed rise in R=2 Δ/ kT c( P) ratio in the framework of the strong...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1999-03, Vol.314 (3), p.205-210
Main Authors: Svistunov, V.M, Tarenkov, V.Yu, D'yachenko, A.I, Aoki, R
Format: Article
Language:English
Subjects:
Andreev spectroscopy
Energy gap
Phonon spectra
Superconductivity
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Summary:A softening of the high-frequency phonon modes in Bi2223 ( T c=110 K) at high pressure is found. These modes correspond to the oxygen breathing mode and also the Cu–O bending modes. Qualitatively, the result obtained explains the observed rise in R=2 Δ/ kT c( P) ratio in the framework of the strong electron–phonon interaction model. However, the analysis of the R-ratio in the framework of the s+d model has revealed a possibility of explanation of the observed rise in R( P) also for the d-wave pairing.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00007-6