Spin dilution in frustrated two-dimensional S=1/2 antiferromagnets on a square lattice

PAPINUTTO, NICO DARIO
CARRETTA, PIETRO
GONTHIER S
MILLET P.

Publication date

January 2005

Publisher

American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704

Abstract

7Li and 29Si nuclear magnetic resonance, muon spin relaxation (muSR), and magnetization measurements in Li2V1−xOTixSiO4, for 0<x<0.2, are presented. The x=0 compound is a prototype of frustrated twodimensional Heisenberg antiferromagnet on a square-lattice with competing nearest- (J1) and next-nearest- (J2) neighbor exchange interactions. Ti4+(S=0) for V4+(S=1/2) substitution yields the spin dilution of the antiferromagnetic 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 muS...

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Spin dilution in frustrated two-dimensional S=1/2 antiferromagnets on a square lattice

Abstract

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Spin dilution in frustrated two-dimensional S=1/2 antiferromagnets on a square lattice

Abstract

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