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VOLUME 70 (1999) | ISSUE 2 | PAGE 93
Two-dimensional quantum interference contributions to the magnetoresistance of Nd2-xCexCuO4-δ single crystals
PACS: 74.72.-h
The 2D weak localization effects at low temperatures τ = (0.2 -Ξ4.2) ë have been investigated in nonsuperconducting sample Ndi.eeCeo.^CuO^s and in the normal state of the superconducting sample Ndi.82Ceo.isCu04_^ for × > J9c2 ~ 3T. The phase coherence time τφ (~ 5 ž 10~11 s at 1.9 K) and the effective thickness of a conducting óÉïÇ layer d(c± 1.5 A) have been estimated by the fitting of 2D weak localization theory expressions to the magnetoresistivity data for the normal to plane and the in-plane magnetic fields. The estimation of the parameter d ensures the condition of a strong carrier confinement and makes a basis to the model of almost decoupled 2D metallic sheets for the Nd2-xCeajCu04-a single crystals.