V 51 NMR study of the spin-gap compound BiCu2 VO6: A microscopic probe of magnetic interactions
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
80
Journal Issue
9
Date Issued
2009
Author(s)
Abstract
We report the results of a V 51 nuclear-magnetic-resonance (NMR) study on the quasi-one-dimensional compound BiCu2 VO6 at temperatures between 4 and 300 K. Three V 51 NMR resonance lines that are associated with three nonequivalent crystallographic sites have been resolved. For each vanadium site, the temperature-dependent NMR shift exhibits a character of low-dimensional magnetism with a broad maximum. At low temperatures, all NMR shifts and spin-lattice relaxation rates clearly indicate thermally activated behavior, confirming the spin-gap formation in BiCu2 VO6. We further analyze the spin shift data based on a proposed spin-ladder scenario with three different types of interactions along the rungs. With this accordance, the spin gaps and the couplings along the rungs of the ladder are properly estimated. © 2009 The American Physical Society.
Type
journal article