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Strong electron-Boson coupling effect in the infrared spectra of $Tl_2 Ba_2 Ca Cu_2 O_{8+δ}$

N. L. Wang·P. Zheng·J. L. Luo·Z. J. Chen·S. L. Yan·L. Fang·Y. C. Ma
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Abstract

We report on a study of the in-plane infrared response of a \TBCCO 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 and the ratio of the reflectances below and above T$_c$ displays a pronounced minimum at around 1000 \cm. 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-Tc cuprates, we find that the gap size scales with T$_c$, but Boson mode energy has a tendency to decrease.

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N. L. Wang, P. Zheng, J. L. Luo, Z. J. Chen, S. L. Yan, L. Fang, Y. C. Ma. 2003-06-27. Strong electron-Boson coupling effect in the infrared spectra of $Tl_2 Ba_2 Ca Cu_2 O_{8+δ}$. https://doi.org/10.1103/physrevb.68.054516

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