Low-dimensional V-based complex oxides: an NMR study

Abstract We performed 31 P and 51 V NMR study of low-dimensional isostructural compounds Sr2V3O9 (T AF =5 K ) and Sr2VP2O9 (T AF =2.8 K ) . Large negative shift of the 51 V spectrum in comparison with Sr2VP2O9 is an evidence of a strong correlation (coupling) between all 51 V nuclei mediated by electron system. 31 P relaxation in Sr2VP2O9 exhibits 2 characteristic relaxation rates (R1short and R1long) with more than 3 orders difference between them. The R1long drastically decreases below 15 K . R1short exceeds in two orders of magnitude the 51 V relaxation rate in Sr2VP2O9, evidencing that P-ions are involved in magnetic hyperfine exchange process via the path V–O–P–O–V.