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@ARTICLE{Stock:15736,
author = {Stock, C. and Chapon, L.C. and Schneidewind, A. and Su, Y.
and Radaelli, P.G. and McMorrow, D.F. and Bombardi, A. and
Lee, N. and Cheong, S.-W.},
title = {{H}elical spin-waves, magnetic order, and fluctuations in
the langasite compound {B}a3{N}b{F}e3{S}i2014},
journal = {Physical review / B},
volume = {83},
number = {10},
issn = {1098-0121},
address = {College Park, Md.},
publisher = {APS},
reportid = {PreJuSER-15736},
pages = {104426},
year = {2011},
note = {We are grateful to A. Orszulik (ISIS) and H. Schneider
(JCNS) for expert technical support throughout the
experiments and to R. Coldea and R. Cowley for helpful
discussions. We are indebted to J. Jensen for very helpful
comments and suggestions. We are also grateful for grants
from the EU-NMI3 Access Program for partial funding of this
research. The work at Rugers was supported by the National
Research Foundation of Korea (Grant No.
KRF-2008-220-C00012).},
abstract = {We have investigated spin fluctuations in the langasite
compound Ba3NbFe3Si2O14 both in the ordered state and as a
function of temperature. The low-temperature magnetic
structure is defined by a spiral phase characterized by
magnetic Bragg peaks at (q) over right arrow = (0,0,tau
similar to 1/7) onset at T-N = 27 K as previously reported
by Marty et al. [Phys. Rev. Lett. 101, 247201 (2008)]. The
nature of the fluctuations and temperature dependence of the
order parameter is consistent with a classical second-order
phase transition for a two-dimensional triangular
antiferromagnet. We show that the physical properties and
energy scales including the ordering wave vector,
Curie-Weiss temperature, and spin waves can be explained
through the use of only symmetric exchange constants without
the need for a dominant Dzyaloshinskii-Moriya interaction.
This is accomplished through a set of "helical" exchange
pathways along the c direction imposed by the chiral crystal
structure and naturally explains the magnetic diffuse
scattering, which displays a strong vector chirality up to
high temperatures, well above the ordering temperature. This
illustrates a strong coupling between magnetic and
crystalline chirality in this compound.},
keywords = {J (WoSType)},
cin = {PGI-4 / JCNS (München) ; Jülich Centre for Neutron
Science JCNS (München) ; JCNS-FRM-II / JCNS-2},
ddc = {530},
cid = {I:(DE-Juel1)PGI-4-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106},
pnm = {Grundlagen für zukünftige Informationstechnologien /
Großgeräte für die Forschung mit Photonen, Neutronen und
Ionen (PNI)},
pid = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
experiment = {EXP:(DE-MLZ)DNS-20140101 / EXP:(DE-MLZ)PANDA-20140101},
shelfmark = {Physics, Condensed Matter},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000288945400005},
doi = {10.1103/PhysRevB.83.104426},
url = {https://juser.fz-juelich.de/record/15736},
}