Classical Spin Liquid or Extended Critical Range in 
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Janas, Sofie; Lass, Jakob; Ţuţueanu, Ana-Elena; Haubro, Morten L.; Niedermayer, Ch.; Stuhr, U.; Xu, Guangyong; Prabhakaran, D.; Deen, P. P.; Holm-Dahlin, Sonja; Lefmann, Kim

doi:10.1103/physrevlett.126.107203

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…This overall behavior is similar to recent observations in a similar compound, the classical spin liquid h-YMnO 3 , which is a triangular-lattice Heisenberg magnet with S = 2 [48]. These single-crystal neutron studies showed that small 2D clusters fluctuate in the classical spin liquid regime and coexist with the spin waves below the 3D ordering transition in a noninteracting manner.…”

Section: Classical Spin Liquid Phasesupporting

confidence: 89%

Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(OD)6(S<

Holm-Janas,

Lolk,

Andersen

et al. 2023

Phys. Rev. B

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The dynamics of the S = 3/2 kagomé antiferromagnet chromium jarosite, KCr 3 (OD) 6 (SO 4 ) 2 , was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice [2.8(2)% Cr vacancies]. Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite-lifetime broadening as well as a pronounced kagomé zero mode. Using linear spin wave theory, we estimate the exchange couplings. The system is highly two dimensional with the leading nearest-neighbor coupling being J 1 = 0.881 meV. Above T N , diffuse excitations from the classical spin liquid regime dominate. We model the Q response and energy response separately and show that in both the ordered phase and the classical spin liquid regime they are strongly coupled.

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Section: Classical Spin Liquid Phasesupporting

confidence: 89%

Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(OD)6(S<

Holm-Janas,

Lolk,

Andersen

et al. 2023

Phys. Rev. B

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“…The first commissioning phase allowed testing CAMEA under various setup, covering different scientific topics. Most results will be communicated in separate publications [10] [11]. Here, we focus on an experiment using a MnF 2 single crystal of 6.2 g. The the spin waves for this spin 5/2 compound have been extensively studied [12], which makes this crystal an ideal calibration sample [13].…”

Section: Spin Waves In Mnf2mentioning

confidence: 99%

Performance of the novel multiplexing spectrometer CAMEA at the Paul Scherrer Institut

Lass¹,

Jacobsen²,

Krighaar³

et al. 2020

Preprint

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The cold neutron multiplexing secondary spectrometer CAMEA (Continuous Angle Multiple Energy Analysis) was commissioned at the Swiss spallation neutron source SINQ at the Paul Scherrer Institut at the end of 2018. The spectrometer is optimised for an efficient data collection in the horizontal scattering plane, allowing for detailed and rapid mapping of excitations under extreme conditions. The novel design consists of consecutive, upward scattering analyzer arcs underneath an array of position sensitive detectors mounted inside a low permeability stainless-steel vacuum vessel. The construction of the world's first continuous angle multiple energy analysis instrument required novel solutions to many technical challenges, including analyzer mounting, vacuum connectors, and instrument movement. These were solved by extensive prototype experiments and in-house developments. Here we present a technical overview of the spectrometer describing in detail the engineering solutions and present our first experimental data taken during the commissioning. Our results demonstrate the tremendous gains in data collection rate for this novel type of spectrometer design.

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“…The software has been written with focus on being userfriendly, offering a scripting, a command line, and a graphical interface. The software was successfully used during the commissioning phase of the CAMEA spectrometer [9] and subsequently for the data treatment of acquired data [10,11].…”

Section: Introductionmentioning

confidence: 99%

MJOLNIR: A Software Package for Multiplexing Neutron Spectrometers

Lass

Jacobsen

Mazzone

et al. 2020

Preprint

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Novel multiplexing triple-axis neutron scattering spectrometers yield significant improvements of the common triple-axis instruments. While the planar scattering geometry keeps ensuring compatibility with complex sample environments, a simultaneous detection of scattered neutrons at various angles and energies leads to tremendous improvements in the data acquisition rate. Here we report on the software package MJOLNIR that we have developed to handle the resulting enhancement in data complexity. Using data from the new CAMEA spectrometer of the Swiss Spallation Neutron Source at the Paul Scherrer Institut, we show how the software reduces, visualises and treats observables measured on multiplexing spectrometers. The software package has been generalised to a uniformed framework, allowing for collaborations across multiplexing instruments at different facilities, further facilitating new developments in data treatment, such as fitting routines and modelling of multi-dimensional data.

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Classical Spin Liquid or Extended Critical Range in h - YMnO3 ?

Cited by 13 publications

References 42 publications

Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(OD)6(S<

Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(OD)6(S<

Performance of the novel multiplexing spectrometer CAMEA at the Paul Scherrer Institut

MJOLNIR: A Software Package for Multiplexing Neutron Spectrometers

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