Magnetic state of vanadium in chalcogenide V7Se8

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Abstract

The structural and magnetic properties of V7Se8 chalcogenide were studied using X-ray diffractometry, magnetic susceptibility measurements and nuclear magnetic resonance (NMR) spectroscopy on 51V nuclei. The ordering of vacancies in vanadium cationic layers with the formation of a 4C-type superstructure was found. It is estimated that the effective magnetic moment of vanadium ions is µeff = 0.35 µB. A significant local charge and magnetic heterogeneity of the V7Se8 compound has been revealed. The hyperfine interaction constant in vanadium ions is estimated from the temperature dependences of the magnetic shift of the NMR 51V line and the susceptibility χ(T) in V7Se8. A joint analysis of the NMR line shift data and the spin-lattice relaxation rate of 51V showed that the 3d-electrons of vanadium are in a itinerant state. At the same time, with decreasing temperature in the V7Se8 system, antiferromagnetic correlations are induced between the magnetic moments of vanadium in adjacent layers.

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About the authors

N. A. Utkin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg; Ekaterinburg

M. E. Kashnikova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg; Ekaterinburg

Yu. V. Piskunov

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

Author for correspondence.
Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

A. G. Smolnikov

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

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

V. V. Ogloblichev

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

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

A. F. Sadykov

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

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

A. P. Gerashchenko

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

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

N. V. Selezneva

Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg

N. V. Baranov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University named after the First President of Russia B. N. Yeltsin

Email: piskunov@imp.uran.ru
Russian Federation, Ekaterinburg; Ekaterinburg

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Supplementary files

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2. Fig. 1. Unit cell of the 4C superstructure of the V7Se8 compound. The dotted lines show the basic unit cell.

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3. Fig. 2. Diffractogram of the compound V7Se8 (space group F2/m). Symbols are observed intensities, solid line is calculation, at the bottom is the difference curve between the observed and calculated intensities. The dashes indicate the position of reflections in the structure described by the space group F2/m.

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4. Fig. 3. Temperature dependence of magnetic susceptibility c(T) in V7Se8 measured in an external magnetic field H = 10 kOe. The inset shows the dependence χ(T) in the temperature range T = 75 – 350 K. The solid line is the result of approximating the experimental data with the expression χ(T) = C/(T – q) + χ0.

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5. Fig. 4. Dependence of 1/(c–c0) on temperature. The solid line is a straight line approximation of the data. The inset shows the dependence of magnetic susceptibility on the inverse temperature 1/T.

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6. Fig. 5. Field dependence of magnetization of the V7Se8 compound at a temperature of 2 K. The inset shows the Belov–Arrot plot. The solid line approximates the high-field linear part of the dependence.

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7. Fig. 6. NMR spectrum of 51V nuclei in a polycrystalline sample of V7Se8 in a magnetic field of H0 = 92.8 kOe at a temperature of T = 293 K and the result of modeling the experimental spectrum with a set of three resonance lines 1–3.

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8. Fig. 7. Temperature dependence of the magnetic shift of 51V nuclei Kiso in V7Se8; the inset shows the dependence Kiso(c) with temperature as a parameter, approximated by a straight line.

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9. Fig. 8. Temperature dependence of the nuclear spin-lattice relaxation rate T1–1. The dashed line is a straight line approximation of the data at T ≥ 90 K.

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