Pseudodipole interaction in exchange-frustrated antiferromagnets

Maleev, S. V.

doi:10.1134/1.567772

Cited by 78 publications

(123 citation statements)

References 21 publications

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“…For our case with the rhombic angle of equal to / 3 this plane is isotropic. From this point of view the properties of the 2D superstructure both of point dipoles or spheres are similar to those of easy plane thin films 21 and even a small disorder in the anisotropy can destroy the longrange order. It is also similar to the case, when-in accordance with Mermin-Wagner theorem-thermal fluctuations can destroy the long-range order in 2D system.…”

Section: ͑2͒mentioning

confidence: 88%

Spin wave dynamics in two- and three-dimensional superlattices of nanosized ferromagnetic spheres

Tartakovskaya

Kreuzpaintner²,

Schreyer³

2008

Journal of Applied Physics

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The dispersion of spin wave modes which due to the dipolar interactions propagate along different directions of ordered superlattices of nanospheres is investigated. For this purpose a procedure similar to the well-known method of linear combination of atomic orbitals is applied. Different geometries of two-dimensional (triangular and square) and three-dimensional (simple cubic and hexagonal-close-packed) arrangements are considered and the influence of dimensionality on the spin wave dynamics is analyzed. A phase transition which is caused by the competition between dipolar and uniaxial anisotropy interactions is predicted by the investigation of the dispersion of the uniform Kittel mode for the superlattice of the hexagonal order. In conclusion, it is shown how the weak dipolar interaction enhances or decreases the relaxation time in the samples with a controlled direction of the easy axis.

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Section: ͑2͒mentioning

confidence: 88%

Spin wave dynamics in two- and three-dimensional superlattices of nanosized ferromagnetic spheres

Tartakovskaya

Kreuzpaintner²,

Schreyer³

2008

Journal of Applied Physics

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“…It also shows the importance of the higher-order terms in Eq. (4), neglected in magnetic studies in which the anisotropic RE-Cu coupling in Nd CuO 2 4 [20,21] and PrBa Cu O 2 3 6+d [22,23] is represented by a pseudo-dipolar term. Table 3 The best-fit values of the exchange parameters a kq (in cm A phenomenological CF analysis of the IR data (Sec.…”

Section: Anisotropy Of the Nd-cu Exchange Interaction In Re Cupratesmentioning

confidence: 99%

Optical study of 4f excitations in rare earth cuprates

Nekvasil

2002

Low Temperature Physics

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Several recent examples are used to demonstrate that Raman and infrared spectroscopy can be successfully used as a novel experimental tool to study microscopic processes involving 4f electrons in rare earth (RE) cuprates. Raman-active crystal field (CF) excitations in Nd CuO 2 4 were measured under hydrostatic pressure up to~7 GPa. The observed pressure-induced shifts of the CF levels were interpreted using density-functional-theory-based ab initio calculations and the superposition model. An infrared transmission study of the 4 I J , J = 9/2, 11/2, 13/2 multiplets of Nd 3+ in Nd CuO 2 4 reveals a splitting of the Kramers doublets of the order of a few cm -1 due to the Nd-Cu exchange interaction. This study shows that these splittings can be described by an effective anisotropic exchange Hamiltonian for the Nd 3+ ion expressed in terms of spherical tensor operators up to the sixth order. The isotropic term in the exchange Hamiltonian vanishes for symmetry reasons in this case. An analysis of the infrared transmission spectra in RE 1+x Ba 2-x Cu 3 O 6+d (RE = Nd, Sm) up to~10 000 cm -1 indicates that, besides the regular sites, the RE ions also occupy Ba sites, even in the samples with the cation stoichiometry 1-2-3.

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“…When one writes down expressions that connect the quantities one measures (x yz spin flip and non spin flip cross sections) and the quantities one is interested in (the nuclear coherent scattering N , nuclear spin-incoherent a e-mail: ehlersg@ornl.gov scattering I , and magnetic scattering M), it turns out that some terms accidentally cancel if the scattering occurs in the x y plane ( Q ⊥ z). As the use of the method can be traced back to the 60s [16,17], this condition was always met, simply because neutron scattering instrumentation was nearly always confined to the x y plane. At a modern TOF instrument this is no longer true, and it is therefore worth going back to the basics of the technique and to develop the measurement protocol further, in particular to achieve a cleaner separation of M.…”

Section: Introductionmentioning

confidence: 99%

Neutronxyz– polarization analysis at a time-of-flight instrument

Ehlers

Stewart

Deen

et al. 2015

EPJ Web of Conferences

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Abstract. When implementing a dedicated polarization analysis setup at a neutron time-of-flight instrument with a large area detector, one faces enormous challenges. Nevertheless, significant progress has been made towards this goal over the last few years. This paper addresses systematic limitations of the traditional method that is used to make these measurements, and a possible strategy to overcome these limitations. This will be important, for diffraction as well as inelastic experiments, where the scattering occurs mostly out-of-plane.

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Pseudodipole interaction in exchange-frustrated antiferromagnets

Cited by 78 publications

References 21 publications

Spin wave dynamics in two- and three-dimensional superlattices of nanosized ferromagnetic spheres

Spin wave dynamics in two- and three-dimensional superlattices of nanosized ferromagnetic spheres

Optical study of 4f excitations in rare earth cuprates

Neutronxyz– polarization analysis at a time-of-flight instrument

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