Electron-Phonon Interaction and Phonon Renormalization in the Lamellar Cobaltate NaxCoO2

被引：1

作者：

Donkov, A. ^{[1
]}

Eremin, I. ^{[1
,2
]}

Knolle, J. ^{[1
]}

Korshunov, M. M. ^{[1
,3
]}

机构：

[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[2] TU Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany

[3] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2009年 / 22卷 / 01期

关键词：

Electron-phonon interaction; Superconductivity; Sodium cobaltate; SUPERCONDUCTIVITY;

D O I：

10.1007/s10948-008-0372-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We study theoretically the electron-phonon interaction in NaxCoO2. For the A(1g) and E-1g phonon modes found in Raman experiments, we calculate the matrix elements of the electron-phonon interaction. Analyzing the feedback effect of the conduction electrons on the phonon frequency., we investigate the doping dependence of these two phonon modes. Due to the momentum dependence of the electron-phonon interaction, we find the strongest renormalization of the E-1g mode around the Brillouin zone boundary which should be observed in the neutron scattering. At the same time, the A(1g) mode shows the strongest coupling to the conducting electrons around the G point and reveals its doping dependence in the Raman experiments. Our results shed light on the possible importance of the electron-phonon interaction in the lamellar sodium cobaltates.

引用

页码：37 / 40

页数：4

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