IN20 - The ILL high-flux polarised-neutron three-axis spectrometer

Kulda, J.; Šaroun, Jan; Courtois, P.; Enderle, M.; Thomas, M.; Flores, Paul

doi:10.1007/s003390101094

Cited by 18 publications

(5 citation statements)

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“…The triple-axis spectrometer (TAS) IN20 was used for magnetic field studies with both horizontal and vertical focusing of the Si(111) monochromator and PG(002) analyzer [25]. A PG(002) filter was placed before the analyzer.…”

Section: Methodsmentioning

confidence: 99%

Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

et al. 2017

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We report detailed neutron scattering studies on Ba2Cu3O4Cl2. The compound consists of two interpenetrating sublattices of Cu, labeled as CuA and CuB, each of which forms a square-lattice Heisenberg antiferromagnet. The two sublattices order at different temperatures and effective exchange couplings within the sublattices differ by an order of magnitude. This yields an inelastic neutron spectrum of the CuA sublattice extending up to 300 meV and a much weaker dispersion of CuB going up to around 20 meV. Using a single-band Hubbard model we derive an effective spin Hamiltonian. From this, we find that linear spin-wave theory gives a good description to the magnetic spectrum. In addition, a magnetic field of 10 T is found to produce effects on the CuB dispersion that cannot be explained by conventional spin-wave theory.

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Section: Methodsmentioning

confidence: 99%

Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

et al. 2017

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“…Inelastic neutron scattering measurements were performed on single crystals of Bi 2 Fe 4 O 9 on the triple-axis spectrometers EIGER (at the Paul-Scherrer-Institut, Switzerland) [8] and IN20 (at the Institut-Laue-Langevin, France) [9]. A co-aligned array of six crystals was used for the EIGER measurements with total sample mass ≈ 0.6 g, while the IN20 measurements used only the largest crystal with mass 0.28 g. The crystals were grown in Bi 2 O 3 flux in Pt crucibles, and their crystallinity and orientations were checked using the Bio-D diffractometer at HANARO, Korea [10].…”

Section: Methodsmentioning

confidence: 99%

Experimental determination of the magnetic interactions of frustrated Cairo pentagon lattice materials

Wheeler

Jeong

et al. 2021

Phys. Rev. B

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We present inelastic neutron scattering measurements of the Cairo pentagon lattice magnets Bi 2 Fe 4 O 9 and Bi 4 Fe 5 O 13 F, supported by high field magnetization measurements of Bi 2 Fe 4 O 9 . Using linear spin wave theory and mean-field analyses we determine the spin exchange interactions and single-ion anisotropy in these materials. The Cairo lattice is geometrically frustrated and consists of two inequivalent magnetic sites, both occupied by Fe 3+ ions and connected by two competing nearest neighbor interactions. We found that one of these interactions, coupling nearest neighbor spins on the threefold symmetric sites, is extremely strong and antiferromagnetic. These strongly coupled dimers are then weakly coupled to a framework formed from spins occupying the other inequivalent site. In addition, we found that the Fe 3+ S = 5/2 spins have a non-negligible single-ion anisotropy, which manifests as a spin anisotropy gap in the neutron spectrum and a spin-flop transition in high field magnetization measurements.

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“…The vacant face of the monochromator block could be modified to accommodate a Heusler-alloy face similar to that recently installed on the TAS instrument IN20 [5]. Alternatively, our preferred route is to use an incident beam 3 He polarizer cell immediately after the monochromator.…”

Section: Polarizing Devicesmentioning

confidence: 98%