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Title: A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF 3

Abstract

Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF{sub 3}. This mode signals the crossover from one-dimensional to three-dimensional behavior and indicates a reduction in the ordered spin moment of a spin-1/2 antiferromagnet. The measurements are compared with recent quantum field theory calculations and are found to be in excellent agreement. A feature of the data not predicted by theory is a damping of the mode by decay processes to the transverse spin-wave branches.

Authors:
Publication Date:
Research Org.:
ORNL Oak Ridge National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
820503
Report Number(s):
P99-105363
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0602135
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 85; Journal Issue: 4; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DAMPING; DECAY; NEUTRONS; QUANTUM FIELD THEORY; SCATTERING; SPIN

Citation Formats

Lake, B. A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3. United States: N. p., 2000. Web. doi:10.1103/PhysRevLett.85.832.
Lake, B. A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3. United States. https://doi.org/10.1103/PhysRevLett.85.832
Lake, B. Sat . "A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3". United States. https://doi.org/10.1103/PhysRevLett.85.832.
@article{osti_820503,
title = {A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3},
author = {Lake, B},
abstractNote = {Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF{sub 3}. This mode signals the crossover from one-dimensional to three-dimensional behavior and indicates a reduction in the ordered spin moment of a spin-1/2 antiferromagnet. The measurements are compared with recent quantum field theory calculations and are found to be in excellent agreement. A feature of the data not predicted by theory is a damping of the mode by decay processes to the transverse spin-wave branches.},
doi = {10.1103/PhysRevLett.85.832},
url = {https://www.osti.gov/biblio/820503}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 4,
volume = 85,
place = {United States},
year = {2000},
month = {1}
}