Strong and complex electron-lattice correlation in optimally doped Bi2Sr2CaCu2O8+δ

被引：16

作者：

Gweon, G. -H. ^{[1
]}

Zhou, S. Y.

Watson, M. C.

Sasagawa, T.

Takagi, H.

Lanzara, A.

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

[3] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[4] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[5] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.97.227001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss the nature of electron-lattice interaction in optimally doped Bi2Sr2CaCu2O8+delta samples, using the isotope effect (IE) in angle resolved photoemission spectroscopy (ARPES) data. The IE in the ARPES linewidth and the IE in the ARPES dispersion are both quite large, implying a strong electron-lattice correlation. The strength of the electron-lattice interaction is "intermediate," i.e., stronger than the Migdal-Eliashberg regime but weaker than the small polaron regime, requiring a more general picture of the ARPES kink than the commonly used Migdal-Eliashberg picture. The two IEs also imply a complex interaction, due to their strong momentum dependence and their differing sign behaviors. In sum, we propose an intermediate-strength coupling of electrons to localized lattice vibrations via charge density fluctuations.

引用

页数：4

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