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Title: Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd{sub 2}BaNiO{sub 5}

Abstract

Magnetic excitations in a Nd{sub 2}BaNiO{sub 5} powder sample were investigated by inelastic neutron scattering. Well-defined one-dimensional (1D) gap modes were observed {ital above} {ital and} {ital below} the N{acute e}el temperature {ital T}{sub {ital N}}=24 K. In both temperature regimes the measured dynamic structure factor was found to be consistent with that calculated for transverse Haldane gap modes in a quantum-disordered {ital S}=1 linear-chain antiferromagnet. The energy gap does not show any appreciable {ital T} dependence at {ital T}{approx_gt}{ital T}{sub {ital N}}. However, in the ordered phase the spin gap {ital increases}. The observed behavior is totally different from that found in other Haldane gap systems undergoing 3D antiferromagnetic ordering, such as CsNiCl{sub 3}. {copyright} {ital 1996 The American Physical Society.}

Authors:
; ;  [1];  [2]
  1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
  2. University of Delaware, Newark, Delaware 19716 (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
383173
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 54; Journal Issue: 10; Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETIC MATERIALS; EXCITATION; NEODYMIUM OXIDES; BARIUM OXIDES; NICKEL OXIDES; QUATERNARY COMPOUNDS; POWDERS; ENERGY GAP; STRUCTURE FACTORS; NEEL TEMPERATURE; NEUTRON DIFFRACTION

Citation Formats

Zheludev, A, Tranquada, J M, Vogt, T, and Buttrey, D J. Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd{sub 2}BaNiO{sub 5}. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.54.7210.
Zheludev, A, Tranquada, J M, Vogt, T, & Buttrey, D J. Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd{sub 2}BaNiO{sub 5}. United States. doi:10.1103/PhysRevB.54.7210.
Zheludev, A, Tranquada, J M, Vogt, T, and Buttrey, D J. Sun . "Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd{sub 2}BaNiO{sub 5}". United States. doi:10.1103/PhysRevB.54.7210.
@article{osti_383173,
title = {Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd{sub 2}BaNiO{sub 5}},
author = {Zheludev, A and Tranquada, J M and Vogt, T and Buttrey, D J},
abstractNote = {Magnetic excitations in a Nd{sub 2}BaNiO{sub 5} powder sample were investigated by inelastic neutron scattering. Well-defined one-dimensional (1D) gap modes were observed {ital above} {ital and} {ital below} the N{acute e}el temperature {ital T}{sub {ital N}}=24 K. In both temperature regimes the measured dynamic structure factor was found to be consistent with that calculated for transverse Haldane gap modes in a quantum-disordered {ital S}=1 linear-chain antiferromagnet. The energy gap does not show any appreciable {ital T} dependence at {ital T}{approx_gt}{ital T}{sub {ital N}}. However, in the ordered phase the spin gap {ital increases}. The observed behavior is totally different from that found in other Haldane gap systems undergoing 3D antiferromagnetic ordering, such as CsNiCl{sub 3}. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevB.54.7210},
journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 54,
place = {United States},
year = {1996},
month = {9}
}