Rare Earth Wave Function Determination by Polarized Neutron Diffraction in REA12

Barbara, B.; Bourcherle, J. X.; Desclaux, J. P.; Rossignol, M.F.; Schweizer, J.

doi:10.1007/978-1-4615-8801-6_29

Cited by 3 publications

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“…When admixtures caused by the actual exchange field and also an applied field of 45 kOe were calculated by Barbara et al, 30 the moment was found to be somewhat larger than that zero net field, but for zero applied field we neglect this effect. Then we write the Hamiltonian in terms of effective spins 1/2 as…”

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Theoretical analysis of the double-q magnetic structure ofCeAl2

Harris

Schweizer

2006

Phys. Rev. B

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A model involving competing short-range isotropic Heisenberg interactions is developed to explain the "double-q" magnetic structure of CeAl2. For suitably chosen interactions terms in the Landau expansion quadratic in the order parameters explain the condensation of incommensurate order at wavevectors in the star of (1/2 − δ, 1/2 + δ, 1/2)(2π/a), where a is the cubic lattice constant. We show that the fourth order terms in the Landau expansion lead to the formation of the so-called "double-q" magnetic structure in which long-range order develops simultaneously at two symmetryrelated wavevectors, in striking agreement with the magnetic structure determinations. Based on the value of the ordering temperature and of the Curie-Weiss Θ of the susceptibility, we estimate that the nearest neighbor interaction, K0, is ferromagnetic with K0/k = −11 ± 1K and the nextnearest neighbor interaction J is antiferromagnetic with J/k = 6 ± 2K. We also briefly comment on the analogous phenomena seen in the similar system, TmS.

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confidence: 99%