Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-05
Phys. Rev. B 73, 144417 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
revised version
Scientific paper
10.1103/PhysRevB.73.144417
Measurements of the static magnetic susceptibility and of the nuclear magnetic resonance of multiwalled vanadium-oxide nanotubes are reported. In this nanoscale magnet the structural low-dimensionality and mixed valency of vanadium ions yield a complex temperature dependence of the static magnetization and the nuclear relaxation rates. Analysis of the different contributions to the magnetism allows to identify individual interlayer magnetic sites as well as strongly antiferromagnetically coupled vanadium spins (S = 1/2) in the double layers of the nanotube's wall. In particular, the data give strong indications that in the structurally well-defined vanadium-spin chains in the walls, owing to an inhomogeneous charge distribution, antiferromagnetic dimers and trimers occur. Altogether, about 30% of the vanadium ions are coupled in dimers, exhibiting a spin gap of the order of 700 K, the other ~ 30% comprise individual spins and trimers, whereas the remaining \~ 40% are nonmagnetic.
Buechner Bernd
Hellmann I.
Kataev Vladislav
Klingeler Rüdiger
Taeschner Ch.
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