Electronic crossover suggested by Raman scattering in overdoped (Y,Ca)Ba2Cu3Oy

Details Electronic crossover suggested by Raman scattering in overdoped (Y,Ca)Ba2Cu3Oy Electronic crossover suggested by Raman scattering in overdoped (Y,Ca)Ba2Cu3Oy

2009-01-06

arxiv.org/abs/0901.0620v1

Physics

Condensed Matter

Superconductivity

13 pages, 5 figures

Scientific paper

The electronic Raman scattering in overdoped (Y,Ca)Ba2Cu3Oy was investigated with changing hole concentration in the superconducting state. It was found that the superconducting responses such as the pair-breaking peaks in the A1g and B1g spectra and the anisotropy of the pair-breaking peak in XX and YY polarizations radically change at around the carrier doping p=0.19. Since both a- and c-axis resistivities strongly suggest the closing of pseudogap at p~0.18, the observed change at p=0.19 in superconducting Raman response is attributed to the electronic crossover due to the collapse of the pseudogap.

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