Experiments on simple magnetic model systems

Jongh, L.J. de; Miedema, A.R.

doi:10.1080/00018739700101558

Cited by 2,125 publications

(804 citation statements)

References 402 publications

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“…Even though three-dimensional antiferromagnetic ordering occurs below TN, shortrange 2D-AF ordering in the CuO2 layers exists at temperatures even far above TN, as reflected in a positive dz/dT at T>> TN [4]. This short-range ordering above TN is typical of behavior in other twodimensional magnets [ 54], e.g. K2NiF4, and in fact, neutron scattering experiments [ 55 ] on La2CuO4 reveal instantaneous spin correlations in the Cu-O planes at T>> TN.…”

Section: Magnetic Propertiesmentioning

confidence: 84%

“…10-12 can be explained roughly by a mean-field-treatment including the D-M interaction and 2D spin correlations. With this model the estimated [45] interlayer exchange coupling in La2CuO4 is ~ 4 × 10-5 of the in-plane superexchange coupling (,,,1400 K); whereas, a typical ratio between them in other 2D magnets [54] is ~ 10 -6. Magnetization measurements [45] below TN indicate that the critical exponent/~ associated with the transition into the WFM state is #_~ 0.5, i.e.…”

Section: Magnetic Propertiesmentioning

confidence: 94%

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Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

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We review the crystal chemical, electronic, magnetic and superconducting properties of La2CuO4 and related planar-cuprate materials, with emphasis on single-crystal results. Although magnetism due to divalent copper ions clearly is evident in nonsuperconducting crystals, experiments do not reveal any direct relationship between localized copper spins and high temperature superconductivity. We also indicate areas where important information is lacking for our understanding of these materials.

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Section: Magnetic Propertiesmentioning

confidence: 84%

Section: Magnetic Propertiesmentioning

confidence: 94%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

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“…It is necessary to note, that average quantities computed by fluctuation relations (3)(4)(5)(6)(7)(8) will correspond to the precise values at m → ∞. Especially strongly it is exhibited at low temperatures and for small m. Thus, for definition of precise value of thermodynamic quantities was used linear or square-law extrapolation [3,5].…”

Section: Models and Methodsmentioning

confidence: 99%

Quantum Monte Carlo study of low-dimensional magnetic system

Муртазаев

Magomedov

2006

Journal of Magnetism and Magnetic Materials

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Monte Carlo simulations are performed for the S = ½ XY and ferroand antiferromagnetic Heisenberg model in two dimensions using the loop algorithm. Thermodynamic properties of all these models are investigated in wide temperature range. The energy, specific heat, susceptibility and other parameters are given as function of temperature and the Trotter number. The comparison of calculated thermodynamic quantities with theoretical and with experimental data are given. It is shown that our results are in good agreement with them.

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“…It is well established 71,72 that the spin-flop field B sf = µ 0 H sf is related to the anisotropy field H A and the exchange field…”

Section: E Pulsed Field Magnetizationmentioning

confidence: 99%

Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX₂(pyz)₂ (X = Cl, Br, I, NCS; pyz = Pyrazine)

et al. 2016

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Magnetism in a family of S = 1 square lattice antiferromagnets NiX 2 (pyz) 2 (X = Cl, Br, I, NCS; pyz = pyrazine) The crystal structures of NiX2(pyz)2 (X = Cl (1), Br (2), I (3) and NCS (4)) were determined at 298 K by synchrotron X-ray powder diffraction. All four compounds consist of two-dimensional (2D) square arrays self-assembled from octahedral NiN4X2 units that are bridged by pyz ligands. The 2D layered motifs displayed by 1-4 are relevant to bifluoride-bridged [Ni(HF2)(pyz)2]ZF6 (Z = P, Sb) which also possess the same 2D layers. In contrast, terminal X ligands occupy axial positions in 1-4 and cause a staggering of adjacent layers. Long-range antiferromagnetic order occurs below 1.5 (Cl), 1.9 (Br and NCS) and 2.5 K (I) as determined by heat capacity and muon-spin relaxation. The single-ion anisotropy and g factor of 2, 3 and 4 are measured by electron spin resonance where no zero-field splitting was found. The magnetism of 1-4 crosses a spectrum from quasi-two-dimensional to three-dimensional antiferromagnetism. An excellent agreement was found between the pulsedfield magnetization, magnetic susceptibility and TN of 2 and 4. Magnetization curves for 2 and 4 calculated by quantum Monte Carlo simulation also show excellent agreement with the pulsed-field data. 3 is characterized as a three-dimensional antiferromagnet with the interlayer interaction (J ⊥ ) slightly stronger than the interaction within the two-dimensional [Ni(pyz)2] 2+ square planes (Jpyz).

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Experiments on simple magnetic model systems

Cited by 2,125 publications

References 402 publications

Properties of La2CuO4 and related compounds

Properties of La2CuO4 and related compounds

Quantum Monte Carlo study of low-dimensional magnetic system

Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX₂(pyz)₂ (X = Cl, Br, I, NCS; pyz = Pyrazine)

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Experiments on simple magnetic model systems

Cited by 2,125 publications

References 402 publications

Properties of La2CuO4 and related compounds

Properties of La2CuO4 and related compounds

Quantum Monte Carlo study of low-dimensional magnetic system

Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX2(pyz)2 (X = Cl, Br, I, NCS; pyz = Pyrazine)

Contact Info

Product

Resources

About

Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX₂(pyz)₂ (X = Cl, Br, I, NCS; pyz = Pyrazine)