Low Temperature Physics: 42, 552 (2016); https://doi.org/10.1063/1.4959012
Физика Низких Температур: Том 42, Выпуск 7 (Июль 2016), c. 705-709    ( к оглавлению , назад )

Synchrotron-based far-infrared spectroscopy of nickel tungstate

A. Kalinko1,2, A. Kuzmin1, P. Roy3, and R.A. Evarestov4

1Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., Riga LV-1063, Latvia
E-mail: a.kuzmin@cfi.lu.lv

2Universität Paderborn, Naturwissenschaftliche Fakultät, Department Chemie 100 Warburger Straße, Paderborn 33098, Germany

3Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette 91192, France

4Department of Quantum Chemistry, St. Petersburg University 26 Universitetskiy Prospekt, Stary Peterhof 198504, Russia

Received January 25, 2016


Monoclinic antiferromagnetic NiWO4 was studied by far-infrared (30–600 cm−1) absorption spectroscopy inthe temperature range of 5–300 K using the synchrotron radiation from SOLEIL source. Two isomorphous CoWO4 and ZnWO4 tungstates were investigated for comparison. The phonon contributions in the far-infrared range of tungstates were interpreted using the first-principles spin-polarized linear combination of atomic orbital calculations. No contributions from magnetic excitations were found in NiWO4 and CoWO4 below their Néel temperatures down to 5 K.

PACS: 78.30.–j Infrared and Raman spectra;
PACS: 71.15.–m Methods of electronic structure calculations.

Key words: NiWO4, CoWO4, ZnWO4, infrared spectroscopy, first-principles calculations.

Published online: May 25, 2016