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@ARTICLE{Li:872664,
author = {Li, Yuesheng and Bachus, Sebastian and Deng, Hao and
Schmidt, Wolfgang and Thoma, Henrik and Hutanu, Vladimir and
Tokiwa, Yoshifumi and Tsirlin, Alexander A. and Gegenwart,
Philipp},
title = {{P}artial {U}p-{U}p-{D}own {O}rder with the {C}ontinuously
{D}istributed {O}rder {P}arameter in the {T}riangular
{A}ntiferromagnet {T}m{M}g{G}a{O} 4},
journal = {Physical review / X},
volume = {10},
number = {1},
issn = {2160-3308},
address = {College Park, Md.},
publisher = {APS},
reportid = {FZJ-2020-00155},
pages = {011007},
year = {2020},
abstract = {We show that frustrated quasidoublets without time-reversal
symmetry can host highly unconventional magnetic structures
with continuously distributed order parameters even in a
single-phase crystal. Our study comprises a comprehensive
thermodynamic and neutron diffraction investigation on the
single crystal of TmMgGaO4, which entails non-Kramers Tm3+
ions arranged on a geometrically perfect triangular lattice.
The crystal electric field randomness caused by the
site-mixing disorder of the nonmagnetic Mg2+ and Ga3+ ions
merges two lowest-lying crystal electric field singlets of
Tm3+ into a ground-state quasidoublet. Well below
Tc∼0.7 K, a small fraction of the
antiferromagnetically coupled Tm3+ Ising quasidoublets with
small inner gaps condense into two-dimensional up-up-down
magnetic structures with continuously distributed order
parameters, and give rise to the columnar magnetic neutron
reflections below μ0Hc∼2.6 T, with highly
anisotropic correlation lengths, ξab≥250a in the
triangular plane and ξc<c/12 between the planes. The
remaining fraction of the Tm3+ ions remain nonmagnetic at 0
T and become uniformly polarized by the applied longitudinal
field at low temperatures. We argue that the similar model
can be generally applied to other compounds of non-Kramers
rare-earth ions with correlated ground-state quasidoublets.},
cin = {JCNS-FRM-II / JCNS-2 / JCNS-ILL / MLZ / PGI-4 / JARA-FIT},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-ILL-20110128
/ I:(DE-588b)4597118-3 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623) / 144 - Controlling
Collective States (POF3-144) / 6212 - Quantum Condensed
Matter: Magnetism, Superconductivity (POF3-621) / 6213 -
Materials and Processes for Energy and Transport
Technologies (POF3-621) / 524 - Controlling Collective
States (POF3-524)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-6212 /
G:(DE-HGF)POF3-6213 / G:(DE-HGF)POF3-524},
experiment = {EXP:(DE-MLZ)POLI-HEIDI-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000506597500001},
doi = {10.1103/PhysRevX.10.011007},
url = {https://juser.fz-juelich.de/record/872664},
}