Disordered materials studied using neutron polarization analysis on the multi-detector spectrometer, D7

Stewart, J. R.; Deen, P. P.; Andersen, K.H.; Schober, H.; Barthélémy, Jean‐François; Hillier, Judith; Murani, A.P.; Hayes, Thomas J.; Lindenau, B.

doi:10.1107/s0021889808039162

Cited by 160 publications

(162 citation statements)

References 43 publications

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“…Measurements were performed using the D7 diffractometer at the Institut Laue-Langevin, Grenoble, France [24]. The incident neutron wavelength was 4.8Å, allowing a reciprocalspace range 0.15 ≤ Q ≤ 2.5Å −1 to be observed.…”

Section: Methodsmentioning

confidence: 99%

Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇

Paddison

Ehlers

Petrenko

et al. 2017

J. Phys.: Condens. Matter

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Abstract. We investigate spin correlations in the dipolar Heisenberg antiferromagnet Gd 2 Sn 2 O 7 using polarised neutron-scattering measurements in the correlated paramagnetic regime. Using Monte Carlo methods, we show that our data are sensitive to weak further-neighbour exchange interactions of magnitude ∼0.5% of the nearestneighbour interaction, and are compatible with either antiferromagnetic next-nearestneighbour interactions, or ferromagnetic third-neighbour interactions that connect spins across hexagonal loops. Calculations of the magnetic scattering intensity reveal rods of diffuse scattering along [111] reciprocal-space directions, which we explain in terms of strong antiferromagnetic correlations parallel to the set of 110 directions that connect a given spin with its nearest neighbours. Finally, we demonstrate that the spin correlations in Gd 2 Sn 2 O 7 are highly anisotropic, and correlations parallel to third-neighbour separations are particularly sensitive to critical fluctuations associated with incipient long-range order.arXiv:1608.05062v1 [cond-mat.str-el]

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Section: Methodsmentioning

confidence: 99%

Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇

Paddison

Ehlers

Petrenko

et al. 2017

J. Phys.: Condens. Matter

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“…Neutron diffraction measurements were performed at the Institut Laue-Langevin, Grenoble, France. Polarized neutron diffraction experiments were carried out using the D7 instrument [27]. D7 is a cold neutron diffuse scattering spectrometer equipped with xyz polarization analysis.…”

Section: Methodsmentioning

confidence: 99%

Field-induced magnetic states in holmium tetraboride

et al. 2017

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A study of the zero field and field induced magnetic states of the frustrated rare earth tetraboride HoB 4 has been carried out using single crystal neutron diffraction complemented by magnetization measurements. In zero field, HoB 4 shows magnetic phase transitions at T N1 = 7.1 K to an incommensurate state with a propagation vector (δ,δ,δ ), where δ = 0.02 and δ = 0.43 and at T N2 = 5.7 K to a noncollinear commensurate antiferromagnetic structure. Polarized neutron diffraction measurements in zero field have revealed that the incommensurate reflections, albeit much reduced in intensity, persist down to 1.5 K despite antiferromagnetic ordering at 5.7 K. At lower temperatures, application of a magnetic field along the c axis initially re-establishes the incommensurate phase as the dominant magnetic state in a narrow field range, just prior to HoB 4 ordering with an up-up-down ferrimagnetic structure characterized by the (h k 1 3 )-type reflections between 18 and 24 kOe. This field range is marked by the previously reported M/M sat = 1 3 magnetization plateau, which we also see in our magnetization measurements. The region between 21 and 33 kOe is characterized by the increase in the intensity of the antiferromagnetic reflections, such as (100), the maximum of which coincides with the appearance of the narrow magnetization plateau with M/M sat ≈ 3 5 . Further increase of the magnetic field results in the stabilization of a polarized state above 33 kOe, while the incommensurate reflections are clearly present in all fields up to 59 kOe. We propose the H -T phase diagram of HoB 4 for the H c containing both stationary and transitionary magnetic phases which overlap and show significant history dependence.

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“…The Monte Carlo simulation matched the D7 instrument [10] in most of the relevant parameters (distances, beam size and divergence, mean wavelength λ = 4.8Å, etc.). A pixilated two-dimensional detector was assumed that covered ±20 • out of plane.…”

Section: Detailed Conditionsmentioning

confidence: 99%

“…For example, one has ∼ 0.4 sr at D7 [9,10], ∼ 0.1 sr at DNS [11,12], and the WASP project at the Institut LaueLangevin (ILL), which is currently under construction, is aiming for ∼ 0.2 sr [13]. These instruments use supermirror analyzers whereas the crystal analyzer instrument MACS at the National Institute for Standards and Technology (NIST) uses an array of wide angle 3 He analyzer cells [14].…”

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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Disordered materials studied using neutron polarization analysis on the multi-detector spectrometer, D7

Cited by 160 publications

References 43 publications

Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇

Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇

Field-induced magnetic states in holmium tetraboride

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

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Disordered materials studied using neutron polarization analysis on the multi-detector spectrometer, D7

Cited by 160 publications

References 43 publications

Spin correlations in the dipolar pyrochlore antiferromagnet Gd2Sn2O7

Spin correlations in the dipolar pyrochlore antiferromagnet Gd2Sn2O7

Field-induced magnetic states in holmium tetraboride

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

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Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇

Spin correlations in the dipolar pyrochlore antiferromagnet Gd₂Sn₂O₇