Magnetic X-ray and neutron scattering from holmium and terbium

Tang, Chiu C.; Stirling, W. G.; Jones, D.L.; Wilson, Chick C.; Haycock, P.W.; Rollason, A.J.; Thomas, A.; Fort, D.

doi:10.1016/0304-8853(92)90241-f

Cited by 25 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

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“…Helimagnetic rare earth metals are more complicated as already discussed in the introduction (see also tables II-IV). The results compatible with those of the MC on STA for Ho [51][52][53] (table II), Dy [53,59,60] (table III) and Tb [64][65][66][67][68] (table IV) can be interpreted as before: the systems are under the influence of F c . The first order transition for Ho [50] and Dy [57,58] is due to the fact that the measurements were done in the first order region near the critical temperature.…”

Section: Discussionsupporting

confidence: 81%

“…Since the angle between the spins can be different from 120 • for the STA-structure without changing the critical behavior [11], helimagnetic rare earths (see ref. [48], for Ho [49][50][51][52][53][54][55][56], for Dy [57][58][59][60][61][62][63] and for Tb [64][65][66][67][68]) could also be analyzed by the STA-model. For helimagnets the critical behavior is quite varied (see the review for Ho and Dy ref.…”

Section: Introductionmentioning

confidence: 99%

“…[54]). Essentially three types of results exist: one in favor of a O(4) class [54,55,61,62], another in favor of a new universality class [51,53,59,60,[64][65][66][67][68], and a third class which favor first order transition [50,57,58]. See Tables II-IV for details. With these results a definite answer cannot be given about the order of transition.…”

Section: Introductionmentioning

confidence: 99%

“…[48], for Ho [49][50][51][52][53][54][55][56], for Dy [57][58][59][60][61][62][63] and for Tb [64][65][66][67][68]) could also be analyzed by the STA-model. For helimagnets the critical behavior is quite varied (see the review for Ho and Dy ref.…”

Section: Introductionmentioning

confidence: 99%

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First and second order transition in frustrated XY systems

Loison

Schotte

1998

Eur. Phys. J. B

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The nature of the phase transition for the XY stacked triangular antiferromagnet (STA) is a controversial subject at present. The field theoretical renormalization group (RG) in three dimensions predicts a first order transition. This prediction disagrees with Monte Carlo (MC) simulations which favor a new universality class or a tricritical transition. We simulate by the Monte Carlo method two models derived from the STA by imposing the constraint of local rigidity which should have the same critical behavior as the original model. A strong first order transition is found. Following Zumbach we analyze the second order transition observed in MC studies as due to a fixed point in the complex plane. We review the experimental results in order to clarify the different critical behavior observed. P.A.C.S. numbers:05.70. Fh, 64.60.Cn,

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First and second order transition in frustrated XY systems

Loison

Schotte

1998

Eur. Phys. J. B

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“…As we will show in this paper, magnetic resonant scattering from terbium in its antiferromagnetic state does not fit into this general picture. The experiments on Tb are rather challenging, since the magnetic moment in the antiferromagnetic, helical state below T N ∼ 230 K remains very small before a transition into a basal-plane ferromagnetic state occurs at T C ∼ 220 K. In the first resonance experiments on Tb [15,16], only the stronger L III resonance was observed, which seemed to behave normally. In a subsequent study [4], the resonance at the L II edge was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Resonant magnetic x-ray scattering from terbium

Strempfer¹,

Hupfeld²,

Voigt³

et al. 2008

J. Phys.: Condens. Matter

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Abstract. Resonant magnetic x-ray scattering from Tb in the spiral phase is studied in great detail. Polarization analysis in the σ − σ and σ − π channels has been performed for magnetic (0, 0, l ± τ ) satellite reflections over the accessible wave vector range Q=1.9-6.5Å −1 . A characteristic splitting of the resonance signal as a function of energy has been observed at the L II as well as at the L III absorption edge. The shape of the resonance depends on Q and is different for the two edges. Up to 3 components were observed with a separation in energy between 3.3 and 4.9 eV, compared to a core hole lifetime broadening of 2.5 eV, which are in agreement with the density of states in Tb-metal.

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Structure Analysis of Crystals

Vainsthein

1994

Fundamentals of Crystals

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In 1912 x-ray diffraction in crystals was discovered, and soon afterwards the structures of rock salt and diamond were determined. This laid the foundation of x-ray structure analysis introducing the physicists to the world of atomic structures of crystals. Later on, two more similar methods -electron and neutron diffraction -came into being.From the mathematical standpoint, the diffraction of short-wave coherent radiation by systems of atoms is the problem of finding the wavefront and intensity in the process of scattering. The determination of the structure of an object from the experimentally observed diffraction field is the reverse problem. It reduces to the solution of complicated sets of equations or integral equations and often has no unambiguous solutions. Both diffraction theory and structure analysis are applied not only to single crystals, but also to less ordered systems, e.g. polycrystals, liquid crystals, solutions of molecules and macromolecules, to liquids and amorphous solids, and finally, to gases.Structure analysis uses various experimental methods. These depend essentially on the ordering of the substance studied and on the type of radiation used. These methods will be the subject of the present chapter.

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Magnetic X-ray and neutron scattering from holmium and terbium

Cited by 25 publications

References 26 publications

First and second order transition in frustrated XY systems

First and second order transition in frustrated XY systems

Resonant magnetic x-ray scattering from terbium

Structure Analysis of Crystals

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