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• W2617686174 abstract "Lattice and magnetic dynamics of NiWO$_4$ single crystals were studied with the use of polarized Raman spectroscopy in a wide temperature range of 10-300 K including the antiferromagnetic ordering temperature $T_N$=62 K. Static magnetic measurements were used for characterizing the single crystals. All Raman-active phonons predicted by the group theory were observed and characterized. Magnetic symmetry analysis was used to determine possible magnetic space groups for NiWO$_4$ which can be also applied to any other isostructural crystal with the same magnetic propagation vector k=(1/2,0,0). Though the magnetic structure of NiWO$_4$ is relatively simple, a rich set of narrow and broad magnetic excitations with different polarization properties and temperature behavior in the very broad frequency range of 10-200 cm$^{-1}$ was observed, with some modes surviving at temperatures much higher than $T_N$ up to 220 K. Part of the magnetic excitations was identified as acoustic and optical spin-wave branches which allow us to construct exchange structure and estimate exchange and anisotropy constants with the use of linear spin-wave theory. Since the magnetic structure can be described as exchange-coupled AFM chains of $S=1$ ions, previously unobserved magnetic excitation at 24 cm$^{-1}$ is tentatively assigned to a Haldane gap mode." @default.
• W2617686174 created "2017-06-05" @default.
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• W2617686174 date "2017-07-20" @default.
• W2617686174 modified "2023-09-23" @default.
• W2617686174 title "Lattice and spin dynamics in a low-symmetry antiferromagnet <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>NiWO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>" @default.
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• W2617686174 doi "https://doi.org/10.1103/physrevb.96.014428" @default.
• W2617686174 hasPublicationYear "2017" @default.
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