On-site magnetization in open antiferromagnetic chains: A classical analysis versus NMR experiments in a spin-1 compound | |
Article | |
关键词: HALDANE-GAP; STAGGERED MAGNETIZATION; NI SUBSTITUTION; Y-89 NMR; O-17 NMR; SUSCEPTIBILITY; EXCITATIONS; IMPURITIES; PROBE; PHASE; | |
DOI : 10.1103/PhysRevB.63.012409 | |
来源: SCIE |
【 摘 要 】
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 nonuniform, 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 termis found to be about half of the original single-spin magnitude and to decrease as the inverse of temperature (i.e., to behave as Curie-like moment). The numerical results are compared to recent NMR findings in spinless-doped Y2BaNiO5; 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.
【 授权许可】
Free