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Disentangling Phononic and Eletronic Glue in HTSC

Unveiling the nature of the bosonic excitations mediating the formation of Cooper pairs is a key issue for understanding superconductivity in copper-oxyde based superconductors (cuprates). We performed optical spectroscopy on Bi2Sr2Ca0.92Y0.08Cu2O8+δ crystals with simultaneous time and frequency resolution. This technique allowed us to disentangle the electronic and phononic contributions by their different temporal evolution.

A fundamental step in understanding the mechanisms of HTC superconductivity would be to identify the relative weight of the electronic and phononic contributions to the overall frequency-dependent bosonic function Π(Ω). 
The spectral distribution of the electronic excitations and the strength of their interaction with fermionic quasiparticles fully account for the high critical temperature of the superconducting phase transition.

Science 335, 1600 (2012) and http://arxiv.org/abs/1203.0588

Last Updated on Wednesday, 18 April 2012 12:13