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@ARTICLE{Kulbakov:890315,
author = {Kulbakov, A. A. and Sarkar, R. and Janson, O. and Dengre,
S. and Weinhold, T. and Moshkina, E. M. and Portnichenko, P.
Y. and Luetkens, H. and Yokaichiya, F. and Sukhanov, A. S.
and Eremina, R. M. and Schlender, Ph. and Schneidewind, A.
and Klauss, H.-H. and Inosov, D. S.},
title = {{D}estruction of long-range magnetic order in an external
magnetic field and the associated spin dynamics in {C}u 2
{G}a{BO} 5 and {C}u 2 {A}l{BO} 5 ludwigites},
journal = {Physical review / B},
volume = {103},
number = {2},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2021-00888},
pages = {024447},
year = {2021},
abstract = {The quantum spin systems Cu2MBO5 (M = Al, Ga) with the
ludwigite crystal structure consist of astructurally ordered
Cu2+ sublattice in the form of three-leg ladders,
interpenetrated by a structurally disorderedsublattice with
a statistically random site occupation by magnetic Cu2+ and
nonmagnetic Ga3+ or Al3+ ions. Amicroscopic analysis based
on density-functional-theory calculations for Cu2GaBO5
reveals a frustrated quasitwo-dimensional spin model
featuring five inequivalent antiferromagnetic exchanges. A
broad low-temperature11B nuclear magnetic resonance points
to a considerable spin disorder in the system. In zero
magnetic field,antiferromagnetic order sets in below TN ≈
4.1 K and ∼2.4 K for the Ga and Al compounds,
respectively. Fromneutron diffraction, we find that the
magnetic propagation vector in Cu2GaBO5 is commensurate and
lies on theBrillouin-zone boundary in the (H0L) plane, qm =
(0.45, 0, −0.7), corresponding to a complex
noncollinearlong-range ordered structure with a large
magnetic unit cell. Muon spin relaxation is monotonic,
consisting of afast static component typical for complex
noncollinear spin systems and a slow dynamic component
originatingfrom the relaxation on low-energy spin
fluctuations. Gapless spin dynamics in the form of a diffuse
quasielasticpeak is also evidenced by inelastic neutron
scattering. Most remarkably, application of a magnetic field
above1 T destroys the static long-range order, which is
manifested in the gradual broadening of the magnetic
Braggpeaks. We argue that such a crossover from a
magnetically long-range ordered state to a spin-glass regime
mayresult from orphan spins on the structurally disordered
magnetic sublattice, which are polarized in magnetic
fieldand thus act as a tuning knob for field-controlled
magnetic disorder.},
cin = {JCNS-FRM-II / MLZ / JCNS-2 / JCNS-4},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-4-20201012},
pnm = {632 - Materials – Quantum, Complex and Functional
Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
Research (JCNS) (FZJ) (POF4-6G4)},
pid = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
experiment = {EXP:(DE-MLZ)PANDA-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000612211100003},
doi = {10.1103/PhysRevB.103.024447},
url = {https://juser.fz-juelich.de/record/890315},
}