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Title: Magnetic excitations and soft-mode transition in the quasi-one-dimensional mixed-spin antiferromagnet Pr{sub 2}BaNiO{sub 5}

Abstract

Neutron diffraction and inelastic neutron scattering were used to investigate three-dimensional (3D) antiferromagnetic ordering and magnetic excitations in Pr{sub 2}BaNiO{sub 5}, a quasi-1D mixed-spin antiferromagnet. Three distinct features of the magnetic excitation spectrum were observed above the N{acute e}el temperature {ital T}{sub {ital N}}: a strongly 1D gap excitation propagating on the Ni chains, a single-ion crystal-field transition associated with Pr{sup 3+}, and a strongly temperature-dependent mixed Pr-Ni magnetic-exciton band. Ni-chain modes persist in the 3D ordered phase, and the energy gap increases with decreasing {ital T} below {ital T}{sub {ital N}}. The magnetic-exciton band undergoes a complete softening at the antiferromagnetic zone center as {ital T}{sub {ital N}} is approached from above, driving the magnetic phase transition. {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:
383250
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 54; Journal Issue: 9; Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PRASEODYMIUM OXIDES; MAGNETIC PROPERTIES; BARIUM OXIDES; NICKEL OXIDES; ANTIFERROMAGNETIC MATERIALS; PHASE TRANSFORMATIONS; COLLECTIVE EXCITATIONS; NEUTRON DIFFRACTION; INELASTIC SCATTERING; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K

Citation Formats

Zheludev, A, Tranquada, J M, Vogt, T, and Buttrey, D J. Magnetic excitations and soft-mode transition in the quasi-one-dimensional mixed-spin antiferromagnet Pr{sub 2}BaNiO{sub 5}. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.54.6437.
Zheludev, A, Tranquada, J M, Vogt, T, & Buttrey, D J. Magnetic excitations and soft-mode transition in the quasi-one-dimensional mixed-spin antiferromagnet Pr{sub 2}BaNiO{sub 5}. United States. doi:10.1103/PhysRevB.54.6437.
Zheludev, A, Tranquada, J M, Vogt, T, and Buttrey, D J. Sun . "Magnetic excitations and soft-mode transition in the quasi-one-dimensional mixed-spin antiferromagnet Pr{sub 2}BaNiO{sub 5}". United States. doi:10.1103/PhysRevB.54.6437.
@article{osti_383250,
title = {Magnetic excitations and soft-mode transition in the quasi-one-dimensional mixed-spin antiferromagnet Pr{sub 2}BaNiO{sub 5}},
author = {Zheludev, A and Tranquada, J M and Vogt, T and Buttrey, D J},
abstractNote = {Neutron diffraction and inelastic neutron scattering were used to investigate three-dimensional (3D) antiferromagnetic ordering and magnetic excitations in Pr{sub 2}BaNiO{sub 5}, a quasi-1D mixed-spin antiferromagnet. Three distinct features of the magnetic excitation spectrum were observed above the N{acute e}el temperature {ital T}{sub {ital N}}: a strongly 1D gap excitation propagating on the Ni chains, a single-ion crystal-field transition associated with Pr{sup 3+}, and a strongly temperature-dependent mixed Pr-Ni magnetic-exciton band. Ni-chain modes persist in the 3D ordered phase, and the energy gap increases with decreasing {ital T} below {ital T}{sub {ital N}}. The magnetic-exciton band undergoes a complete softening at the antiferromagnetic zone center as {ital T}{sub {ital N}} is approached from above, driving the magnetic phase transition. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevB.54.6437},
journal = {Physical Review, B: Condensed Matter},
number = 9,
volume = 54,
place = {United States},
year = {1996},
month = {9}
}