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000890315 1001_ $$0P:(DE-HGF)0$$aKulbakov, A. A.$$b0
000890315 245__ $$aDestruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu 2 GaBO 5 and Cu 2 AlBO 5 ludwigites
000890315 260__ $$aWoodbury, NY$$bInst.$$c2021
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000890315 520__ $$aThe 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.
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000890315 7001_ $$0P:(DE-HGF)0$$aSarkar, R.$$b1
000890315 7001_ $$0P:(DE-HGF)0$$aJanson, O.$$b2
000890315 7001_ $$0P:(DE-HGF)0$$aDengre, S.$$b3
000890315 7001_ $$0P:(DE-HGF)0$$aWeinhold, T.$$b4
000890315 7001_ $$00000-0001-7250-0387$$aMoshkina, E. M.$$b5
000890315 7001_ $$0P:(DE-HGF)0$$aPortnichenko, P. Y.$$b6
000890315 7001_ $$0P:(DE-HGF)0$$aLuetkens, H.$$b7
000890315 7001_ $$00000-0002-6860-9053$$aYokaichiya, F.$$b8
000890315 7001_ $$0P:(DE-HGF)0$$aSukhanov, A. S.$$b9
000890315 7001_ $$00000-0002-8262-011X$$aEremina, R. M.$$b10
000890315 7001_ $$00000-0003-4624-8733$$aSchlender, Ph.$$b11
000890315 7001_ $$0P:(DE-Juel1)156579$$aSchneidewind, A.$$b12
000890315 7001_ $$0P:(DE-HGF)0$$aKlauss, H.-H.$$b13
000890315 7001_ $$0P:(DE-HGF)0$$aInosov, D. S.$$b14$$eCorresponding author
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