Magnetic State of Layered Cobalt Chalcogenides Co7Se8 and Co7Te8

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Abstract

The structural and magnetic properties of the Co7Te8 layered compound have been studied for the first time using X-ray diffraction, measurements of the magnetic susceptibility, and nuclear magnetic resonance spectroscopy on 59Co nuclei. The nuclear magnetic resonance study of Co7Se8 selenide with the same structural type (NiAs) as Co7Te8 has also been performed for the first time. In contrast to Co7Se8, the ordering of vacancies and Co atoms in cation layers is absent in the Co7Te8 compound, and its crystal structure is more planar and is characterized by a significantly smaller ratio c0/a0 compared to Co7Se8 (a0 and c0 are the basic lattice parameters of NiAs). The components of the magnetic shift and electric field gradient tensors at the location of Co nuclei have been determined. A significant local charge and spin inhomogeneity of the co-mpounds has been revealed. The hyperfine coupling constant in Co ions has been estimated from the te-mperature dependences of the shift and susceptibility in Co7Te8. An anisotropic increase in the interatomic distances does not increase the localization of 
 electrons and does not lead to the appearance of magnetic moments on Co atoms in Co7Te8. This compound remains a Pauli paramagnet down to the lowest tempe-ratures.

About the authors

Yu. V Piskunov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia

V. V Ogloblichev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia

A. F Sadykov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia

D. F Akramov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia; 620002, Yekaterinburg, Russia

A. G Smol'nikov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia

A. P Gerashchenko

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia

N. V Selezneva

Ural Federal University

Email: piskunov@imp.uran.ru
620002, Yekaterinburg, Russia

N. V Baranov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University

Author for correspondence.
Email: piskunov@imp.uran.ru
620108, Yekaterinburg, Russia; 620002, Yekaterinburg, Russia

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