DYNAMIC STRUCTURE FACTOR [S(Q,OMEGA)] OF THE S = 1 QUASI-ONE-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET - NEUTRON-SCATTERING STUDY ON AGVP2S6

被引：71

作者：

MUTKA, H

PAYEN, C

MOLINIE, P

SOUBEYROUX, JL

COLOMBET, P

TAYLOR, AD

机构：

[1] INST MAT NANTES,F-44072 NANTES 03,FRANCE

[2] RUTHERFORD APPLETON LAB,DIV NEUTRON,DIDCOT OX11 0QX,OXON,ENGLAND

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.67.497

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The spin correlations of the S = 1 Heisenberg antiferromagnetic chains in AgVP2S6 have been studied by neutron scattering at temperatures of the order of T approximately 10(-2) J/k(B). On the polycrystalline samples, with a careful choice of experimental conditions, we have observed a Haldane gap of E(g) = 26 meV at the antiferromagnetic point at q = pi. The excitation spectra are consistent with a mode that has a spin-wave velocity C = 150 meV and a correlation length zeta almost-equal-to 5.5, close to C/E(g). These results are in quantitative agreement with the predictions and numerical results on the Haldane state.

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页码：497 / 500

页数：4

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