Bond-stretching phonon anomalies and charge fluctuations in copper oxide superconductors

被引:7
作者
Cojocaru, S.
Citro, R.
Marinaro, M.
机构
[1] Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, SA, Italy
[2] Univ Salerno, CNISM, I-84081 Baronissi, SA, Italy
[3] IIASS, I-84019 Vietri Sul Mare, SA, Italy
[4] Inst Appl Phys, Kishinev 2028, Moldova
关键词
D O I
10.1103/PhysRevB.75.014516
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
On the basis of a semiphenomenological model, it is argued that the anomalous properties of the bond-stretching (BS) in-plane phonon modes in cuprate superconductors and some other metallic perovskite oxides are due to coupling to the mid-infrared structure in the electronic charge fluctuation spectrum. The energy scale of this charge mode is several times larger than the phonon frequency, i.e., within 0.2-0.6 eV, and its doping and momentum dependence is discussed in relation to experimentally observed behavior of the BS phonons. Experiments on the effect of oxygen isotope substitution on the phonon softening and linewidth are suggested as a source of important information on the charge excitations, and equations describing isotope effects are derived. The set of equations is overcomplete and can therefore serve as a consistency test for the model. We discuss how the midinfrared scenario could offer an explanation of anomalous BS phonon observed in different perovskites in a unified framework.
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页数:8
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