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

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

2003-06-27

arxiv.org/abs/cond-mat/0306688v1

Physical Review B 68, 054516 (2003)

Physics

Condensed Matter

Superconductivity

to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.054516

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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