Localization and Interaction Effects in Strongly Underdoped La2-xSrxCuO4

Details Localization and Interaction Effects in Strongly Underdoped La2-xSrxCuO4 Localization and Interaction Effects in Strongly Underdoped La2-xSrxCuO4

2004-03-16

arxiv.org/abs/cond-mat/0403386v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, to appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.92.187003

The in-plane magnetoresistance (MR) in La2-xSrxCuO4 films with 0.03 < x < 0.05 has been studied in the temperature range 1.6 K to 100 K, and in magnetic fields up to 14 T, parallel and perpendicular to the CuO2 planes. The behavior of the MR is consistent with a predominant influence of interaction effects at high temperatures, switching gradually to a regime dominated by spin scattering at low T. Weak localization effects are absent. A positive orbital MR appears close to the boundary between the antiferromagnetic and the spin-glass phase, suggesting the onset of Maki-Thompson superconducting fluctuations deep inside the insulating phase.

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