Phase diagrams of weakly anisotropic Heisenberg antiferromagnets, nonlinear excitations (solitons) and random-field effects

Groot, Huub J. M. de; Jongh, L.J. de

doi:10.1016/0378-4363(86)90346-3

Cited by 40 publications

(67 citation statements)

References 114 publications

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“…[31][32][33] However, a new maximum emerges around 0.3 K which is not a feature of ideal 1D Heisenberg S = 1/2 antiferromagnets. 34 At higher fields, this new maximum merges with the one initially seen around 3 K.…”

Section: Resultsmentioning

confidence: 93%

Finite-temperature scaling of spin correlations in a partially magnetized HeisenbergS=12chain

et al. 2015

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Inelastic neutron scattering is employed to study transverse spin correlations of a Heisenberg S = 1/2 chain compound in a magnetic field of 7.5 T. The target compound is the antiferromagnetic Heisenberg S = 1/2 chain material 2(1,4-Dioxane)·2(H2O)·CuCl2, or CuDCl for short. The validity and the limitations of the scaling relation for the transverse dynamic structure factor are tested, discussed and compared to the Tomonaga-Luttinger spin liquid theory and to Bethe-ansatz results for the Heisenberg model.

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Section: Resultsmentioning

confidence: 93%

Finite-temperature scaling of spin correlations in a partially magnetized HeisenbergS=12chain

et al. 2015

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“…26,27 The whole process of SF is an act of reducing the energy of the system which, otherwise, is higher if one of the AFM sub-lattice's moments In fact, it is interesting to note that a FM spin-structure in a honeycomb lattice system (even though a classical ground state) is another possible magnetic phase of the HK model 13,29 that is widely studied at present. It may be possible to observe a field-induced FM phase in a honeycomb lattice system (e.g., Li 2 MnO 3 or a similar one) at extremely high magnetic fields.…”

Section: Discussionmentioning

confidence: 99%

“…At higher fields, for example H = 14 T, the changes in magnetization corresponding to both H || c* and H ^ c* appear to be very similar. The minima in M are due to the SF transitions corresponding to the specific values of H ^ ab-plane (i.e., H || c*), because these occur only for H applied (nearly) parallel / antiparallel to the direction of the magnetic moments (μ) of an antiferromagnet with low anisotropy 27 and not for H ^ μ. We note here that, in principle, the SF transitions can be either first order or second order.…”

Section: Magnetic Structure Of LI 2 Mnomentioning

confidence: 99%

Successive spin-flop transitions of a Néel-type antiferromagnetLi2MnO3single crystal with a honeycomb lattice

et al. 2014

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PACS titles: Spin arrangements in magnetically ordered materials, Exchange and superexchange interactions, Magnetic phase boundaries including meta-magnetism. AbstractWe have carried out high magnetic field studies of single-crystalline Li 2 MnO 3 , a honeycomb lattice antiferromagnet. Its magnetic phase diagram was mapped out using magnetization measurements at applied fields up to 35 T. Our results show that it undergoes two successive meta-magnetic transitions around 9 T fields applied perpendicular to the ab-plane (along the c*-axis). These phase transitions are completely absent in the magnetization measured with field applied along the ab-plane. In order to understand this magnetic phase diagram, we developed a mean-field model starting from the correct Néel-type magnetic structure, consistent with our single crystal neutron diffraction data at zero field. Our model calculations succeeded in explaining the two meta-magnetic transitions that arise when Li 2 MnO 3 enters two different spinflop phases from the zero field Néel phase.

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“…The square lattice, uniaxially anisotropic Heisenberg antiferromagnet in an external field H parallel to the easy axis has been studied since more than two decades both in its classical version 1,2,3,4 and in the quantum variant. 5,6 However, important features of the phase diagram have not been definitely clarified.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional anisotropic Heisenberg antiferromagnet in a magnetic field

2005

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The classical, square lattice, uniaxially anisotropic Heisenberg antiferromagnet in a magnetic field parallel to the easy axis is studied using Monte Carlo techniques. The model displays a longrange ordered antiferromagnetic, an algebraically ordered spin-flop, and a paramagnetic phase. The simulations indicate that a narrow disordered phase intervenes between the ordered phases down to quite low temperatures. Results are compared to previous, partially conflicting findings on related classical models as well as the quantum variant with spin S=1/2.

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Phase diagrams of weakly anisotropic Heisenberg antiferromagnets, nonlinear excitations (solitons) and random-field effects

Cited by 40 publications

References 114 publications

Finite-temperature scaling of spin correlations in a partially magnetized HeisenbergS=12chain

Finite-temperature scaling of spin correlations in a partially magnetized HeisenbergS=12chain

Successive spin-flop transitions of a Néel-type antiferromagnetLi2MnO3single crystal with a honeycomb lattice

Two-dimensional anisotropic Heisenberg antiferromagnet in a magnetic field

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