Abstract
In order to investigate the origin of the anomalous dip in T c at x ≊ 0.115 for La 2x Sr x CuO 4 , the temperature dependence of 63/65Cu/ 139La-NMR spectra has been studied on samples prepared by the spray-dry method. Spectra of 63/65Cu-NMR for the sample x ≊ 0.115 showed a huge broadening at 4.2 K, demonstrating the existence of the antiferromagnetic ordering of 3 d-spins. The Néel temperature determined by 139La-NMR, showed maximum of T N ≊ 32 K at x=0.115 , which just coincided with the location of the dip in T c , suggesting the crucial interplay between the antiferromagnetism and the suppression in T c .
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