Metallic nonsuperconducting phase and d-wave superconductivity in Zn-substituted LaSrCuO
K. Karpinska, Marta Z. Cieplak, S. Guha, A. Malinowski, T. Skoskiewicz, W. Plesiewicz, M. Berkowski, B. Boyce, Thomas R. Lemberger, P. Lindenfeld
Abstract
Measurements of the resistivity, magnetoresistance and penetration depth were made on films of LaSrCuO with up to 12 at.% of Zn substituted for the Cu. The results show that the quadratic temperature dependence of the inverse square of the penetration depth, indicative of d-wave superconductivity, is not affected by doping. The suppression of superconductivity leads to a metallic nonsuperconducting phase, as expected for a pairing mechanism related to spin fluctuations. The metal-insulator transition occurs in the vicinity of kFl~1, and appears to be disorder-driven, with the carrier concentration unaffected by doping.
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