89Y NMR imaging of the staggered magnetization in the doped Haldane chain Y2BaNi1-xMgxO5

被引：64

作者：

Tedoldi, F

Santachiara, R

Horvatic, M

机构：

[1] INFM, Dept Phys A Volta, I-27100 Pavia, Italy

[2] CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble 09, France

[3] FKF, MPI, F-38042 Grenoble 09, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.83.412

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a static. model-independent, experimental determination of the spin-spin correlation length xi in a quantum spin system. This is achieved in the doped Haldane (i.e., S = 1 Heisenberg antiferromagnetic) chain Y2BaNi1-xMgxO5 by Y-89 NMR imaging of the staggered magnetization induced around the Mg impurities (i.e., chain boundaries) by a magnetic field. The magnitude of this magnetization is found to decay exponentially, with xi equal to the theoretical prediction or an infinite S = 1 chain and the staggered magnetic moment at the edge site showing the Curie behavior of an effective S = 1/2 spin.

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页码：412 / 415

页数：4

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