Strong electron-boson coupling effect in the infrared spectra of Tl2Ba2CaCu2O8+delta

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    T-C SUPERCONDUCTORS;    LINE-SHAPE;    BI2SR2CACU2O8+DELTA;    DISPERSION;    FLUCTUATIONS;    REFLECTANCE;    PSEUDOGAP;    DYNAMICS;    DENSITY;   

DOI  :  10.1103/PhysRevB.68.054516

来源: SCIE

【 摘 要 】

We report on a study of the in-plane infrared response of a Tl2Ba2CaCu2O8+delta film with T-c=108 K. The fingerprint evidence for a strong electron-boson coupling has been observed. The raw reflectance below T-c exhibits a knee structure at around 650 cm(-1) and the ratio of the reflectances below and above T-c displays a pronounced minimum at around 1000 cm(-1). In particular, the features appear at higher energy scale than other bilayer cuprates with T-c around 90-95 K. The gap amplitude and the boson mode energy were extracted from the analysis of the bosonic spectral function. In comparison with several other optimally doped high-T-c cuprates, we find that the gap size scales with T-c, but boson mode energy has a tendency to decrease.

【 授权许可】

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