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Tsyrulin, N.; Fan, Xing; Schneidewind, A.; Link, P.; Rønnow, Henrik M.; Gavilano, J. L.; Landee, Christopher P.; Turnbull, Mark M.; Kenzelmann, M.

doi:10.1103/physrevb.81.134409

Cited by 61 publications

(92 citation statements)

References 31 publications

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“…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%

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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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Section: Next Nearest-neighbor Interactionsmentioning

confidence: 99%

“…We have performed dipole-field calculations given a certain assumed collinear antiferromagnetic structure inspired by the structure suggested for 4 on the basis of neutron-diffraction experiments 55 . The calculations leave the direction of each individual moment variable.…”

Section: Dipolar Interactionsmentioning

confidence: 99%

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

et al. 2016

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“…III C. In particular, we find for the easy-plane anisotropy using expressions for ω that is in agreement with values of 2×10 −3 , 3×10 −3 , 5×10 −3 , and 5.5×10 −3 reported for this quantity in Refs. 7,8,10,12 , respectively. To plot ω 1 (H) at H > H sf in Fig.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…Magnon spectrum analysis carried out in Cu(pz) 2 (ClO 4 ) 2 in neutron scattering experiment 7 gives J ≈ 18.1(4) K. The value of magnetic moment was found at T = 2.3 K and H = 0 to be 0.47(5)µ B that corresponds to the renormalized spin value of S = 0.23 (2). In accordance with the experiment, one obtains at T = 2.3 K using Eq.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…[5][6][7][8][9][10][11] Exchange coupling constant between spins from neighboring planes does not exceed 9 mK and dipolar forces are expected to play a significant role in the interlayer coupling. 8 Recent antiferromagnetic resonance (AFR) experiment 12 reveals also an in-plane easy-axis anisotropy (that is an order of magnitude smaller than the easy-plane one) and a related spin-flop transition at magnetic field H = H sf ≈ 0.42 T having anomalous properties.…”

Section: 4mentioning

confidence: 99%

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Spin-flop transition accompanied with changing the type of magnetic ordering

Syromyatnikov

2017

Journal of Magnetism and Magnetic Materials

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We discuss theoretically rather rear example of spin-flop transition which is accompanied with changing the type of magnetic ordering and which seemingly has not been addressed yet. We demonstrate that changing the type of magnetic ordering can manifest itself in antiferromagnetic (AF) resonance experiments as an apparent peculiar switching of the anisotropy at the transition from the easy-axis type to the easy-plane one. We argue that this kind of spin-flop transition is observed recently by K. Yu. Povarov et al., Phys. Rev. B 87, 214402 (2013) in Cu(pz)2(ClO4)2 (where pz denotes pyrazine), one of the best realizations of spin-Heisenberg AFs on square lattice having a very small anisotropy. We show that the magnetic ordering changes at the spin-flop transition in this material in the direction perpendicular to AF square planes. We examine the microscopic mechanism of such behavior in Cu(pz)2(ClO4)2 and find that dipolar forces and extremely small exchange coupling between spins from neighboring planes are responsible for it.

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