On the resistivity at low temperatures in electron-doped cuprate superconductors - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We measured the magnetoresistance as a function of temperature down to 20mKand magnetic field for a set of underdoped PrCeCuO x=0.12 thin films withcontrolled oxygen content. This allows us to access the edge of thesuperconducting dome on the underdoped side. The sheet resistance increaseswith increasing oxygen content whereas the superconducting transitiontemperature is steadily decreasing down to zero. Upon applying various magneticfields to suppress superconductivity we found that the sheet resistanceincreases when the temperature is lowered. It saturates at very lowtemperatures. These results, along with the magnetoresistance, cannot bedescribed in the context of zero temperature two dimensionalsuperconductor-to-insulator transition nor as a simple Kondo effect due toscattering off spins in the copper-oxide planes. We conjecture that due to theproximity to an antiferromagnetic phase magnetic droplets are induced. Thisresults in negative magnetoresistance and in an upturn in the resistivity.



Autor: S. Finkelman, M. Sachs, J. Paglione, G. Droulers, P. Bach, R.L. Greene, Y. Dagan

Fuente: https://arxiv.org/



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