Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-07-17
Phys. Rev. B 63, 012409 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 eps figures; minor changes in the text; added references
Scientific paper
10.1103/PhysRevB.63.012409
The response of an open spin chain with isotropic antiferromagnetic interactions to a uniform magnetic field is studied by classical Monte Carlo simulations. It is observed how the induced on-site magnetization is non uniform, due to the occurrence of edge staggered terms which decay exponentially over a distance equal to the zero field correlation length of the infinite chain. The total magnetic moment associated to each staggered term is found to be about half of the original single-spin magnitude and to decrease as the inverse of temperature (i.e. to behave as a Curie-like moment). The numerical results are compared to recent NMR findings in spinless-doped Y(2)BaNiO(5); the remarkable agreement found shows that, for temperatures above the Haldane gap, the classical approach gives a correct picture of the boundary effects observed in the Heisenberg S=1 chain.
Botti Silvana
Rosso Alberto
Santachiara Raoul
Tedoldi F.
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