Novel type of neutron polarization analysis using the multianalyzer-equipment of the three-axes spectrometer PUMA

Schwesig, Steffen; Maity, Avishek; Sobolev, Oleg; Ziegler, Fabian; Eckold, G.

doi:10.1016/j.nima.2017.09.032

Cited by 3 publications

(7 citation statements)

References 7 publications

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“…Due to the characteristic relaxation of the He polarization, P 0 is time dependent and has to be calculated for each individual scan point. The parameters D + and D − are determined to be 1.05 and −0.86, respectively …”

Section: Methodsmentioning

confidence: 99%

“…The parameters D þ and D À are determined to be 1.05 and À0.86, respectively. [19] Neighboring multianalyzer channels are used to determine the instrumental background and allow the determination of backgroundcorrected intensities.…”

Section: Methodsmentioning

confidence: 99%

“…While the incident neutron beam is polarized perpendicular to the scattering plane using a 3 He‐spin filter cell, the two spin states of the scattered neutron beam are spatially separated by FeSi multilayer deflectors and thus directed toward different channels (5, 6, and 7) of the PUMA multianalyzer. Details of this setup along with the method that allows the quantitative determination of SF and NSF intensities from the individual detector count rates are described in a previous study. The basic relations include two general calibration parameters D + and D − as well as the polarization P 0 of the initial neutron beam provided by the 3 He filter

I_{SF} = \frac{1}{2} I_{6} - \frac{D_{-}}{2} (I_{5} + I_{7}) - \frac{1}{2 P_{0}} (I_{6} - D_{+} (I_{5} + I_{7}))

I_{NSF} = \frac{1}{2} I_{6} - \frac{D_{-}}{2} (I_{5} + I_{7}) + \frac{1}{2 P_{0}} (I_{6} - D_{+} (I_{5} + I_{7}))

…”

Section: Methodsmentioning

confidence: 99%

“…For our experiments, we used the thermal neutron three-axes spectrometer PUMA@FRM II with its novel type of polarization analysis equipment. [19] This method proved to be a powerful tool not only for the characterization of the eigenvector of magnons but also for saving precious beam time because both spin states are measured simultaneously. We restricted ourselves to neutron polarization parallel or antiparallel to the magnetic b-direction, of the CuO sample, rather than attempting to provide a full 3D analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Details of the magnon dispersion, on the contrary, are beyond the scope of this article. For our experiments, we used the thermal neutron three‐axes spectrometer PUMA@FRM II with its novel type of polarization analysis equipment . This method proved to be a powerful tool not only for the characterization of the eigenvector of magnons but also for saving precious beam time because both spin states are measured simultaneously.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Magnons in the Multiferroic Phase of Cupric Oxide

Maity

Schwesig

Ziegler

et al. 2020

Physica Status Solidi (b)

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Polarized neutron scattering is used to characterize low-energy magnetic excitations in the multiferroic and antiferromagnetic phases of cupric oxide (CuO). The experiments are performed with the novel type of polarization analysis available at the thermal three-axes spectrometer PUMA@FRM, II allowing the simultaneous detection of spinflip and nonspinflip scattering. The energy gaps of several magnon modes are determined, and evidence for the existence of electromagnons near 3 and 13 meV is found.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

I_{SF} = \frac{1}{2} I_{6} - \frac{D_{-}}{2} (I_{5} + I_{7}) - \frac{1}{2 P_{0}} (I_{6} - D_{+} (I_{5} + I_{7}))

I_{NSF} = \frac{1}{2} I_{6} - \frac{D_{-}}{2} (I_{5} + I_{7}) + \frac{1}{2 P_{0}} (I_{6} - D_{+} (I_{5} + I_{7}))

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnons in the Multiferroic Phase of Cupric Oxide

Maity

Schwesig

Ziegler

et al. 2020

Physica Status Solidi (b)

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Spin dynamics and exchange interactions in CuO measured by neutron scattering

et al. 2018

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The magnetic properties of CuO encompass several contemporary themes in condensed matter physics, including quantum magnetism, magnetic frustration, magnetically-induced ferroelectricity and orbital currents. Here we report polarized and unpolarized neutron inelastic scattering measurements which provide a comprehensive map of the cooperative spin dynamics in the low temperature antiferromagnetic (AFM) phase of CuO throughout much of the Brillouin zone. At high energies (E 100 meV) the spectrum displays continuum features consistent with the des Cloizeax-Pearson dispersion for an ideal S = 1 2 Heisenberg AFM chain. At lower energies the spectrum becomes more three-dimensional, and we find that a linear spin-wave model for a Heisenberg AFM provides a very good description of the data, allowing for an accurate determination of the relevant exchange constants in an effective spin Hamiltonian for CuO. In the high temperature helicoidal phase, there are features in the measured low-energy spectrum that we could not reproduce with a spin-only model. We discuss how these might be associated with the magnetically-induced multiferroic behavior observed in this phase.

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Investigation of the Structure and Dynamics of Multiferroic Systems by Inelastic Neutron Scattering and Complementary Methods

Ziegler¹

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Novel type of neutron polarization analysis using the multianalyzer-equipment of the three-axes spectrometer PUMA

Cited by 3 publications

References 7 publications

Magnons in the Multiferroic Phase of Cupric Oxide

Magnons in the Multiferroic Phase of Cupric Oxide

Spin dynamics and exchange interactions in CuO measured by neutron scattering

Investigation of the Structure and Dynamics of Multiferroic Systems by Inelastic Neutron Scattering and Complementary Methods

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