Quantum Effects in a Weakly Frustrated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Two-Dimensional Heisenberg Antiferromagnet in an Applied Magnetic Field

Tsyrulin, N.; Pardini, T.; Singh, Rajiv R. P.; Fan, Xing; Link, P.; Schneidewind, A.; Hiess, A.; Landee, Christopher P.; Turnbull, Mark M.; Kenzelmann, M.

doi:10.1103/physrevlett.102.197201

Cited by 47 publications

(45 citation statements)

References 29 publications

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“…16 Extensive experimental investigations, carried out on a number of vanadium-based square-lattice compounds Li 2 VOSiO 4 and Li 2 VOGeO 4 , reveal AFM J 1 and J 2 . 20 The AFM J 1 and J 2 have also been found for other systems, such as the two-dimensional (2D) square-lattice antiferromagnet Cu(pz) 2 (ClO 4 ) 2 (where pz denotes pyrazine), 21 VOMoO4, 22 and the layered perovskite PbVO 3 . 23,24 The square-lattice layered vanadium phosphate AA VO(PO 4 ) 2 with AA = Zn 2 also reveals AFM J 1 and J 2 .…”

Section: Introductionmentioning

confidence: 97%

Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

et al. 2011

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Magnetic correlation in the quantum S = 1/2 square-lattice system (CuBr)Sr 2 Nb 3 O 10 has been studied by neutron diffraction. A novel commensurate in-plane, helical antiferromagnetic (AFM) ordering, characterized by the propagation vector k = (0 3/8 1/2), has been confirmed from the appearance of magnetic Bragg peaks below T N ∼ 7.5 K. The ordered moment at 2 K is found to be 0.79(7) μ B /Cu 2+ -ion. The observed helical AFM structure differs from the ground state predicted theoretically from the J 1 -J 2 model as well as from experimentally reported states for other quantum S = 1/2 square-lattice systems. However, the observed helical magnetic structure can be described in a J 1 -J 2 -J 3 model. Under a 4.5 T magnetic field, the spin-order changes drastically and is characterized by the propagation vector k 1 = (0 1/3 0.446) and a probable k 2 = (0 0 0) vector.

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Section: Introductionmentioning

confidence: 97%

Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

et al. 2011

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“…The authors of Ref. 53 estimated J 2 0.02J 1 from their spin-wave data on 4. A later neutron spectroscopy study 55 expanded this analysis to conclude a small XY anisotropy in J 1 , which will be discussed in more detail later.…”

Section: Next Nearest-neighbor Interactionsmentioning

confidence: 99%

Control of the third dimension in copper-based square-lattice antiferromagnets

et al. 2016

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Using a mixed-ligand synthetic scheme, we create a family of quasi-two-dimensional antiferromagnets, namely, [Cu(HF2)(pyz)2]ClO4 [pyz = pyrazine], [CuL2(pyz)2](ClO4)2 [L = pyO = pyridine-N-oxide and 4-phpyO = 4-phenylpyridine-N-oxide. These materials are shown to possess equivalent two-dimensional [Cu(pyz)2] 2+ nearly square layers, but exhibit interlayer spacings that vary from 6.5713Å to 16.777Å, as dictated by the axial ligands. We present the structural and magnetic properties of this family as determined via x-ray diffraction, electron-spin resonance, pulsed-and quasistatic-field magnetometry and muon-spin rotation, and compare them to those of the prototypical two-dimensional magnetic polymer Cu(pyz)2(ClO4)2. We find that, within the limits of the experimental error, the two-dimensional, intralayer exchange coupling in our family of materials remains largely unaffected by the axial ligand substitution, while the observed magnetic ordering temperature (1.91 K for the material with the HF2 axial ligand, 1.70 K for the pyO and 1.63 K for the 4-phpyO) decreases slowly with increasing layer separation. Despite the structural motifs common to this family and Cu(pyz)2(ClO4)2, the latter has significantly stronger two-dimensional exchange interactions and hence a higher ordering temperature. We discuss these results, as well as the mechanisms that might drive the long-range order in these materials, in terms of departures from the ideal S = 1/2 two-dimensional square-lattice Heisenberg antiferromagnet. In particular, we find that both spin exchange anisotropy in the intralayer interaction and interlayer couplings (exchange, dipolar, or both) are needed to account for the observed ordering temperatures, with the intralayer anisotropy becoming more important as the layers are pulled further apart.

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“…The strong-field regime is now reachable for a number of layered square-lattice materials with moderate strength of exchange coupling between spins. [2][3][4][5] In addition, new field-induced dynamical effects can be present in the antiferromagnets with other lattice geometries 6,7 as well as in the gapped quantum spin systems near the condensation field for triplet excitations. [8][9][10][11][12][13][14] The ground-state properties of the square-lattice antiferromagnet in a finite field conform with the semiclassical picture of spins gradually tilted towards the field direction, 15 see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18] Following the prediction of the field-induced spontaneous magnon decays in Ref. 16, there is an ongoing search for suitable spin-1/2 square-lattice materials [2][3][4][5] to investigate such an effect. The existence of substantial damping in the magnon spectrum of the square-lattice Heisenberg model in a field has been recently verified by the Quantum Monte Carlo 17 (QMC) and the Exact Diagonalization 18 numerical study.…”

Section: Introductionmentioning

confidence: 99%

Field-induced decay dynamics in square-lattice antiferromagnets

2010

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Dynamical properties of the square-lattice Heisenberg antiferromagnet in applied magnetic field are studied for arbitrary value S of the spin. Above the threshold field for two-particle decays, the standard spin-wave theory yields singular corrections to the excitation spectrum with logarithmic divergences for certain momenta. We develop a self-consistent approximation applicable for S ≥ 1, which avoids such singularities and provides regularized magnon decay rates. Results for the dynamical structure factor obtained in this approach are presented for S = 1 and S = 5/2.

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Quantum Effects in a Weakly FrustratedS=1/2Two-Dimensional Heisenberg Antiferromagnet in an Applied Magnetic Field

Cited by 47 publications

References 29 publications

Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

Control of the third dimension in copper-based square-lattice antiferromagnets

Field-induced decay dynamics in square-lattice antiferromagnets

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