Data di Pubblicazione:
2005
Abstract:
7Li and 29Si nuclear magnetic resonance, muon spin relaxation (muSR), and magnetization measurements in Li2V1−xOTixSiO4, for 0
layers. The analysis of the magnetization and of the nuclear spin-lattice relaxation rate shows that spin dilution not only reduces the spin stiffness by a factor .around (1−x)^2, but also causes the decrease of the effective ratio J2(x) /J1(x). Moreover, the sublattice magnetization curves derived from zero-field muSR measurements in the collinear phase point out that, at variance with nonfrustrated two-dimensional Heisenberg
antiferromagnets, spin dilution affects the low-temperature staggered magnetization only to a minor extent. This observation is supported also by the x dependence of the collinear ordering temperature. The results obtained for the Ti doped samples are discussed in the light of the results previously obtained in the pure x=0 compound and in nonfrustrated two-dimensional Heisenberg antiferromagnets with spin dilution.
layers. The analysis of the magnetization and of the nuclear spin-lattice relaxation rate shows that spin dilution not only reduces the spin stiffness by a factor .around (1−x)^2, but also causes the decrease of the effective ratio J2(x) /J1(x). Moreover, the sublattice magnetization curves derived from zero-field muSR measurements in the collinear phase point out that, at variance with nonfrustrated two-dimensional Heisenberg
antiferromagnets, spin dilution affects the low-temperature staggered magnetization only to a minor extent. This observation is supported also by the x dependence of the collinear ordering temperature. The results obtained for the Ti doped samples are discussed in the light of the results previously obtained in the pure x=0 compound and in nonfrustrated two-dimensional Heisenberg antiferromagnets with spin dilution.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
magneti frustrati; diluizione di spin; risonanze magnetiche
Elenco autori:
Papinutto, NICO DARIO; Carretta, Pietro; Gonthier, S; Millet, P.
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