Spin correlations in the frustrated ferro-antiferromagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>SrZnVO</mml:mi><mml:mo>(</mml:mo><mml:msub><mml:mi>PO</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
 near saturation

Landolt, Florian; Povarov, K. Yu.; Yan, Z.; Gvasaliya, S. N.; Ressouche, E.; Raymond, Stéphane; Garlea, V. Ovidiu; Zheludev, A.

doi:10.1103/physrevb.106.054410

Phys. Rev. B

2022

DOI: 10.1103/physrevb.106.054410

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Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation

Florian Landolt

K. Yu. Povarov

Z. Yan

et al.

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2024

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Cited by 2 publications

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Implementation of a laser–neutron pump–probe capability for inelastic neutron scattering

Hua,

Tennant,

Savici

et al. 2024

Review of Scientific Instruments

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Knowledge about nonequilibrium dynamics in spin systems is of great importance to both fundamental science and technological applications. Inelastic neutron scattering (INS) is an indispensable tool to study spin excitations in complex magnetic materials. However, conventional INS spectrometers currently only perform steady-state measurements and probe averaged properties over many collision events between spin excitations in thermodynamic equilibrium, while the exact picture of re-equilibration of these excitations remains unknown. In this paper, we report on the design and implementation of a time-resolved laser–neutron pump–probe capability at hybrid spectrometer (beamline 14-B) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. This capability allows us to excite out-of-equilibrium magnons with a nanosecond pulsed laser source and probe the resulting dynamics using INS. Here, we discussed technical aspects to implement such a capability in a neutron beamline, including choices of suitable neutron instrumentation and material systems, laser excitation scheme, experimental configurations, and relevant firmware and software development to allow for time-synchronized pump–probe measurements. We demonstrated that the laser-induced nonequilibrium structure factor is able to be resolved by INS in a quantum magnet. The method developed in this work will provide SNS with advanced capabilities for performing out-of-equilibrium measurements, opening up an entirely new research direction to study out-of-equilibrium phenomena using neutrons.

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Implementation of a laser–neutron pump–probe capability for inelastic neutron scattering

Hua,

Tennant,

Savici

et al. 2024

Review of Scientific Instruments

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Narrowly avoided spin-nematic phase in BaCdVO(PO4)2: NMR evidence

Ranjith,

Povarov,

Yan

et al. 2024

Phys. Rev. Research

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We present a P31 NMR investigation of BaCdVO(PO4)2 focusing on the nearly saturated regime between μ0Hc1=4.05T and μ0Hc2=6.5T, which used to be considered a promising candidate for a spin-nematic phase. NMR spectra establish the absence of any dipolar order there, whereas the weak field dependence of the magnetization above Hc1 is accounted for by Dzyaloshinskii-Moriya interaction terms. The low-energy spin dynamics (fluctuations), measured by the nuclear spin-lattice relaxation rate T1−1, confirms the continuity of this phase and the absence of any low-temperature phase transition. Unexpectedly, the spin dynamics above Hc1 is largely dominated by two-magnon processes, which is expected the saturation field of a spin-nematic phase, but not inside. This shows that BaCdVO(PO4)2 is indeed close to a spin-nematic instability; however, this phase is stabilized. We thus confirm recent theoretical predictions that the spin-nematic phase can be stabilized, at most, in an extremely narrow field range close to saturation or is rather narrowly avoided [Jiang , ]. Published by the American Physical Society 2024

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Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation

Cited by 2 publications

References 24 publications

Implementation of a laser–neutron pump–probe capability for inelastic neutron scattering

Implementation of a laser–neutron pump–probe capability for inelastic neutron scattering

Narrowly avoided spin-nematic phase in BaCdVO(PO4)2: NMR evidence

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