Strong enhancement of electron-phonon interaction due to charge fluctuations in oxide superconductors and their high Tc superconductivity

M. Tachiki; Saburo Takahashi; Y. Syono; Y. Namba; Y. Fukuda; M. Nagoshi

doi:10.1016/0921-4534(88)90571-0

Strong enhancement of electron-phonon interaction due to charge fluctuations in oxide superconductors and their high T_c superconductivity

M. Tachiki, Saburo Takahashi, Y. Syono, Y. Namba, Y. Fukuda, M. Nagoshi

Materials Property Division

Research output: Contribution to journal › Article › peer-review

Abstract

It is theoretically predicted that large charge fluctuations are induced in the copper oxides by the interplay of the electron transfer between Cu- and O-ions and the Coulomb interaction. The interaction between the charge fluctuations and the LO phonons strongly enhances the spectral density of the vibration in the metallic samples. This theoretical prediction was confirmed by electron energy loss spectroscopy; the loss intensity at the vibration frequency in the superconducting samples of YBa₂Cu₃O_7-δ is much stronger than that in the non-superconducting samples. The enhancement of the spectral intensity effectively strengthens the electron-phonon interaction and causes the enhancement of T_c.

Original language	English
Pages (from-to)	239-240
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	153-155
Issue number	PART 1
DOIs	https://doi.org/10.1016/0921-4534(88)90571-0
Publication status	Published - 1988 Jan 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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Strong enhancement of electron-phonon interaction due to charge fluctuations in oxide superconductors and their high T_c superconductivity. / Tachiki, M.; Takahashi, Saburo; Syono, Y.; Namba, Y.; Fukuda, Y.; Nagoshi, M.

In: Physica C: Superconductivity and its applications, Vol. 153-155, No. PART 1, 01.01.1988, p. 239-240.

Research output: Contribution to journal › Article › peer-review

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AU - Nagoshi, M.

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AB - It is theoretically predicted that large charge fluctuations are induced in the copper oxides by the interplay of the electron transfer between Cu- and O-ions and the Coulomb interaction. The interaction between the charge fluctuations and the LO phonons strongly enhances the spectral density of the vibration in the metallic samples. This theoretical prediction was confirmed by electron energy loss spectroscopy; the loss intensity at the vibration frequency in the superconducting samples of YBa2Cu3O7-δ is much stronger than that in the non-superconducting samples. The enhancement of the spectral intensity effectively strengthens the electron-phonon interaction and causes the enhancement of Tc.

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