Low-Dimensional V-based Complex Oxides: an NMR Study

GIPPIUS, A. A.; MOROZOVA, E. N.; KHOZEEV, D. F.; SHPANCHENKO, R. V.; KAUL, E. E.; GEIBEL, C.; RABIS, A.; BAENITZ, M.; STEGLICH, F.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Elsevier

Año: 2004 vol. 272 p. 956 - 957

0304-8853

We performed 31P and 51V NMR study of low-dimensional isostructural compounds Sr2V3O9 (T_AF = 5 K) and Sr2VP2O9 (T_AF = 2.8K). Large negative shift of the 51V spectrum in comparison with Sr2VP2O9 is an evidence of a strong correlation (coupling) between all 51V nuclei mediated by electron system. 31P 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 51V relaxation rate in Sr2VP2O9, evidencing that P-ions are involved in magnetic hyperfine exchange process via the path V–O–P–O–V.