Abstract

The effects of Zn substitution on the uniform ( q = 0) magnetic susceptibility, χ( T), of optimally doped ( x = 0.15) La 2− x Sr x Cu 1− y Zn y O 4 sintered samples were investigated over a wide range of Zn contents ( y). Non-magnetic Zn was found to enhance χ( T) systematically and depress T c very effectively. We have extracted the characteristic pseudogap energy scale, ε g , from the analysis of χ( T) data. Unlike T c , ε g was found to be fairly insensitive to the level of Zn substitution. This supports the scenario where the pseudogap phenomenon has non-superconducting origin. We have also analyzed the Zn-induced Curie-like enhancement of the χ( T) data using different models and discussed the various possible implications.

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