skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2

Abstract

Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe{sub 2}As{sub 2} reveal steeply dispersive and well-defined spin waves up to an energy of {approx}100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
977244
Report Number(s):
IS-J 7492
Journal ID: 0031-9007; TRN: US1004149
DOE Contract Number:  
DE-AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 102; Journal Issue: 187206
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXCITATION; DAMPING; HEISENBERG MODEL; MAGNETIC SUSCEPTIBILITY; MONOCRYSTALS; NEUTRONS; RESOLUTION; SCATTERING; SPIN WAVES

Citation Formats

Diallo, S, Antropov, V, Perring, T, Broholm, C, Pulikkotil, J, Ni, N, Bud'ko, S, Canfield, P, Kreyssig, A, Goldman, A, and McQueeney, R. Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2. United States: N. p., 2009. Web.
Diallo, S, Antropov, V, Perring, T, Broholm, C, Pulikkotil, J, Ni, N, Bud'ko, S, Canfield, P, Kreyssig, A, Goldman, A, & McQueeney, R. Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2. United States.
Diallo, S, Antropov, V, Perring, T, Broholm, C, Pulikkotil, J, Ni, N, Bud'ko, S, Canfield, P, Kreyssig, A, Goldman, A, and McQueeney, R. Thu . "Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2". United States.
@article{osti_977244,
title = {Itinerant Magnetic Excitations in Antiferromagnetic CaFe2As2},
author = {Diallo, S and Antropov, V and Perring, T and Broholm, C and Pulikkotil, J and Ni, N and Bud'ko, S and Canfield, P and Kreyssig, A and Goldman, A and McQueeney, R},
abstractNote = {Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe{sub 2}As{sub 2} reveal steeply dispersive and well-defined spin waves up to an energy of {approx}100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.},
doi = {},
journal = {Physical Review Letters},
number = 187206,
volume = 102,
place = {United States},
year = {2009},
month = {5}
}