Observation of antiferromagnetic correlations in the NaxWO3 system at a low carrier density
Garifullin I. A., Garif'yanov N. N., Maramzin V. Yu., Khaliullin G. G.
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.