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VOLUME 54 (1991) | ISSUE 7 | PAGE 380
Observation of antiferromagnetic correlations in the NaxWO3 system at a low carrier density
The ESR of Gd3 + ions was studied in Nax W03:Gd samples. It was found that strong short-range exchange interactions arise between gadolinium impurities as the sodium concentration in the samples is reduced from л; = 0.90 to л: = 0.25. Possible reasons for the formation of exchange clusters are discussed.