Analogies of phonon anomalies and electronic gap features in the infrared response of Sr (14-x) Ca x Cu24O41 and underdoped YBa2Cu3O 6+x

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Authors

ADAMUS Petr XU Bing MARSIK Premysl DUBROKA Adam BARABASOVÁ Paulína RŮŽIČKOVÁ Hana PUPHAL Pascal POMJAKUSHINA Ekaterina TALLON Jeffery L. MATHIS Yves-Laurent MUNZAR Dominik BERNHARD Christian

Year of publication 2023
Type Article in Periodical
Magazine / Source Reports on Progress in Physics
MU Faculty or unit

Faculty of Science

Citation
web https://doi.org/10.1088/1361-6633/acbe4f
Doi http://dx.doi.org/10.1088/1361-6633/acbe4f
Keywords infrared spectroscopy; high-Tc cuprates; strongly correlated electron systems
Description We present an experimental and theoretical study which compares the phonon anomalies and the electronic gap features in the infrared response of the weakly coupled two-leg-ladders in Sr 14-x CaxCu24O41 (SCCO) with those of the underdoped high-T ( c ) superconductor YBa2Cu3O 6+x 2 planes) of YBCO. We further confirm that an insulator-like pseudogap develops in the a-axis conductivity of SCCO which closely resembles that in the c-axis conductivity of YBCO. Most surprisingly, we find that the c-axis conductivity (field along the legs of the ladders) of SCCO is strikingly similar to the in-plane one (field parallel to the CuO2 planes) of YBCO. Notably, in both cases a dip feature develops in the normal state spectra that is connected with a spectral weight shift toward low frequencies and can thus be associated with precursor superconducting pairing correlations that are lacking macroscopic phase coherence. This SCCO-YBCO analogy indicates that collective degrees of freedom contribute to the low-energy response of underdoped high T ( c ) cuprates and it even suggests that the charges in the CuO2 planes tend to segregate forming quasi-one-dimensional structures similar to the two-leg ladders, as predicted for the stripe-scenario or certain intertwinned states.
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