Commissioning of the novel Continuous Angle Multi-energy Analysis spectrometer at the Paul Scherrer Institut

Lass, Jakob; Jacobsen, Henrik; Krighaar, Kristine M. L.; Gräf, D.; Groitl, Felix; Herzog, Frank; Yamada, Masako; Kägi, Christian; Müller, Raphael A.; Bürge, Roman; Schild, M.; Lehmann, Manuel S.; Bollhalder, A.; Keller, P.; Bartkowiak, M.; Filges, Uwe; Greuter, U.; Theidel, Gerd; Rønnow, Henrik M.; Niedermayer, Ch.; Mazzone, D. G.

doi:10.1063/5.0128226

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…4 . Our neutron scattering experiments were performed on the time-of-flight (ToF) Cold Neutron Chopper Spectrometer (CNCS) 63 at the Spallation Neutron Source at Oak Ridge National Laboratory (ORNL), the multiplexing Continuous Angle Multiple Energy Analysis spectrometer (CAMEA) 64 , and the cold-neutron Triple-Axis Spectrometer (TASP), the latter both located at the Swiss Spallation Neutron Source (SINQ) at the Paul Scherrer Institut (PSI). The measurements at CNCS were performed with an incident neutron energy E i = 3.32 meV, providing an energy resolution of 0.11 meV.…”

Section: Methodsmentioning

confidence: 99%

Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2

Xie,

Eberharter,

Xing

et al. 2023

npj Quantum Mater.

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Fifty years after Anderson’s resonating valence-bond proposal, the spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) remains the ultimate platform to explore highly entangled quantum spin states in proximity to magnetic order. Yb-based delafossites are ideal candidate TLHAF materials, which allow experimental access to the full range of applied in-plane magnetic fields. We perform a systematic neutron scattering study of CsYbSe2, first proving the Heisenberg character of the interactions and quantifying the second-neighbor coupling. We then measure the complex evolution of the excitation spectrum, finding extensive continuum features near the 120°-ordered state, throughout the 1/3-magnetization plateau and beyond this up to saturation. We perform cylinder matrix-product-state (MPS) calculations to obtain an unbiased numerical benchmark for the TLHAF and spectacular agreement with the experimental spectra. The measured and calculated longitudinal spectral functions reflect the role of multi-magnon bound and scattering states. These results provide valuable insight into unconventional field-induced spin excitations in frustrated quantum materials.

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Section: Methodsmentioning

confidence: 99%

Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2

Xie,

Eberharter,

Xing

et al. 2023

npj Quantum Mater.

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“…1], the disk chopper spectrometer (AMATERAS) 35 at the Materials and Life Science Experimental Facility (MLF) of J-PARC [Fig. 2], and the Continuous Angle Multiple Energy Analysis (CAMEA) spectrometer 36,37 at the Paul Scherrer Institut (PSI) [See Supplementary Note 1 22 ].…”

Section: Methodsmentioning

confidence: 99%

“…CAMEA measurements. The CAMEA 36,37 data set was collected in a vertical field 11 T magnet at T = 40 mK. Due to the nature of the multiplex analyser, runs collected at E i = 3.5, 3.6, 4.48, and 4.6 meV were merged for four positions of the 60 ∘ -wide (in scattering angle) detector tank with the center scattering angle set to −38 ∘ , −42 ∘ , −54 ∘ , and −58 ∘ .…”

Section: Methodsmentioning

confidence: 99%

Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl3

Sala,

Stone,

Halász

et al. 2023

Commun Phys

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The basis for our understanding of quantum magnetism has been the study of elegantly simple model systems. However, even for the antiferromagnetic honeycomb lattice with isotropic spin interactions–one of the simplest model systems–a detailed understanding of quantum effects is still lacking. Here, using inelastic neutron scattering measurements of the honeycomb lattice material YbCl3, we elucidate how quantum effects renormalize the single-magnon and multimagnon excitations and how this renormalization can be tuned and ultimately driven to the classical limit by applying a magnetic field. Additionally, our work reveals that the quantum effects tuned by the magnetic field not only renormalize the magnetic excitations but also induce a distinctive sharp feature inside the multimagnon continuum. From a more general perspective, this result demonstrates that structures within magnetic continua can occur over a wide experimental parameter space and can be used as a reliable means of identifying quantum phenomena.

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“…The magnetic field effect on CEF states was investigated on the CAMEA multiplexing neutron spectrometer at the Swiss spallation neutron source of the Paul Scherrer Institute [31]; the obtained data were analyzed with the MJOLNIR program [32]. The NaTmTe 2 samples were co-aligned in the same scattering plane, while the external fields were applied along the c direction.…”

Section: Inelastic Neutron Scattering Measurementsmentioning

confidence: 99%

Interplay between crystal field and magnetic anisotropy in the triangular-lattice antiferromagnet NaTmTe2

Zheng,

Gu,

et al. 2024

Phys. Rev. B

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We have successfully synthesized a triangular lattice magnet, NaTmTe 2 , and conducted thermodynamic and inelastic neutron scattering (INS) investigations using single-crystal samples. Our magnetic susceptibility χ (T ) measurements indicate antiferromagnetic interactions between Tm 3+ moments. In our INS experiments, we observe a series of dispersive crystal electric field (CEF) excitations. These dispersions could be attributed to quantum tunneling effects arising from anisotropic spin exchange interactions, spontaneously establishing connections between distinct CEF states. Additionally, the field-dependent behavior of the CEF states exhibits pronounced nonlinear characteristics, suggestive of quantum fluctuations within the rare-earth moments. Utilizing the mean field technology of the random phase approximation, we compute the magnetic excitation spectra and thermodynamic properties, unveiling the emergence of a unique ground state primarily driven by quantum effects.

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Commissioning of the novel Continuous Angle Multi-energy Analysis spectrometer at the Paul Scherrer Institut

Cited by 12 publications

References 20 publications

Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2

Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2

Field-tuned quantum renormalization of spin dynamics in the honeycomb lattice Heisenberg antiferromagnet YbCl3

Interplay between crystal field and magnetic anisotropy in the triangular-lattice antiferromagnet NaTmTe2

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