Polarized-neutron observation of longitudinal haldane-gap excitations in Nd2BaNiO5

被引：44

作者：

Raymond, S

Yokoo, T

Zheludev, A

Nagler, SE

Wildes, A

Akimitsu, J

机构：

[1] CENG, DRFMC SPSMS MDN, F-38054 Grenoble, France

[2] Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 157, Japan

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[5] Inst Laue Langevin, Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.82.2382

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap.

引用

收藏

页码：2382 / 2385

页数：4

相关论文

共 24 条

[1] STRUCTURAL CHARACTERIZATION AND POLYMORPHISM OF R2BANIO5 (R = ND, GD, DY, Y, HO, ER, TM, YB) STUDIED BY NEUTRON-DIFFRACTION [J].

GARCIAMATRES, E ;

MARTINEZ, JL ;

RODRIGUEZCARVAJAL, J ;

ALONSO, JA ;

SALINASSAHCNEZ, A ;

SAEZPUCHE, R .

JOURNAL OF SOLID STATE CHEMISTRY, 1993, 103 (02) :322-333

[2] HALDANE GAPS IN A SPIN-1 HEISENBERG CHAIN WITH EASY-PLANE SINGLE-ION-ANISOTROPY [J].

GOLINELLI, O ;

JOLICOEUR, T ;

LACAZE, R .

PHYSICAL REVIEW B, 1992, 45 (17) :9798-9805

[3] THE MAGNETIC-FIELD BEHAVIOR OF A HALDANE-GAP ANTIFERROMAGNET [J].

GOLINELLI, O ;

JOLICOEUR, T ;

LACAZE, R .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (42) :7847-7858

[4] NON-LINEAR FIELD-THEORY OF LARGE-SPIN HEISENBERG ANTI-FERROMAGNETS - SEMI-CLASSICALLY QUANTIZED SOLITONS OF THE ONE-DIMENSIONAL EASY-AXIS NEEL STATE [J].

HALDANE, FDM .

PHYSICAL REVIEW LETTERS, 1983, 50 (15) :1153-1156

[5] INELASTIC POLARIZED NEUTRON-SCATTERING FROM S=1 ANTIFERROMAGNETIC CSNICL3 IN AN APPLIED FIELD [J].

KAKURAI, K ;

STEINER, M ;

PYNN, R ;

KJEMS, JK .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1991, 3 (06) :715-726

[6]

LOU J, UNPUB

[7] Coexistence of Haldane-gap excitations and long-range antiferromagnetic order in mixed-spin nickelates R2BaNiO5 [J].

Maslov, S ;

Zheludev, A .

PHYSICAL REVIEW B, 1998, 57 (01) :68-71

[8] Universal behavior of one-dimensional gapped antiferromagnets in a staggered magnetic field [J].

Maslov, S ;

Zheludev, A .

PHYSICAL REVIEW LETTERS, 1998, 80 (26) :5786-5789

[9] Temperature evolution of the magnetic structures in R2BaNiO5 oxides [J].

Matres, EG ;

Martinez, JL ;

RodriguezCarvajal, J .

PHYSICA B, 1997, 234 :567-568

[10] POLARIZATION ANALYSIS OF THERMAL-NEUTRON SCATTERING [J].

MOON, RM ;

RISTE, T ;

KOEHLER, WC .

PHYSICAL REVIEW, 1969, 181 (02) :920-&