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