Prof. Igor Lyubutin

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Academic Career Length

32Years (1995-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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25 August 2023 in Advanced Science

Journal Article

Non‐Fermi‐Liquid Behavior of Superconducting SnH₄

Ivan A. Troyan

Dmitrii V. Semenok

Anna G. Ivanova

Andrey V. Sadakov

Di Zhou

Igor Lyubutin

+10

The chemical interaction of Sn with H₂ by X‐ray diffraction methods at pressures of 180–210 GPa is studied. A previously unknown tetrahydride SnH₄ with a cubic structure (fcc) exhibiting superconducting properties below T_C = 72 K is obtained; the formation of a high molecular C2/m‐SnH₁₄ superhydride and several lower hydrides, fcc SnH₂, and C2‐Sn₁₂H₁₈, is also detected. The temperature dependence of critical current density J_C(T) in SnH₄ yields the superconducting gap 2Δ(0) = 21.6 meV at 180 GPa. SnH₄ has unusual behavior in strong magnetic fields: B,T‐linear dependences of magnetoresistance and the upper critical magnetic field B_C2(T) ∝ (T_C – T). The latter contradicts the Wertheimer–Helfand–Hohenberg model developed for conventional superconductors. Along with this, the temperature dependence of electrical resistance of fcc SnH₄ in non‐superconducting state exhibits a deviation from what is expected for phonon‐mediated scattering described by the Bloch‐Grüneisen model and is beyond the framework of the Fermi liquid theory. Such anomalies occur for many superhydrides, making them much closer to cuprates than previously believed.

4 January 2013 in Journal of Nanoparticle Research

Journal Article

Magnetic, structural, and electronic properties of iron sulfide Fe3S4 nanoparticles synthesized by the polyol mediated process

Shin-Zong Lu

R. Ivantsov

9 August 2012 in Physical Review B

Journal Article

Phenomenological model of multiferroic properties in langasite-type crystals with a triangular magnetic lattice

S. A. Pikin

Igor Lyubutin

The conditions for occurrence of the magnetoelectric, magnetoelastic, and piezomagnetic effects in crystals of the langasite family with a triangular magnetic lattice are considered on the basis of the phenomenological model. It is shown that the iron-containing langasites with a triangular magnetic lattice may have piezoelectric properties above the N\`eel temperature TN, but they are not ferroelectrics. Occurrence of either ferroelectric or both ferroelectric and piezoelectric states is possible below TN, and these crystals can be considered as multiferroics with a helicoid of magnetic moments oriented along the c axis. The observation of electric polarization pz in these crystals at T<TN is possible at sufficiently large values of piezocoefficients ezyz (class 2) or ezxx (class 3) and as a result of mechanical deformations occurring due to magnetostriction. Moreover, because of magnetoelastic interactions (appearing due to lowering symmetry P321 $\rightarrow${} P3 below TN), the electric polarization and the axis of the magnetic helicoid can both be parallel to the z axis even in the absence of the Dzyaloshinskii-Moriya (DM) effect. Possible ferroelastic and ferroelectric transitions are considered at T<TN. The occurrence of the magnetic helicoid with its axis in the ab plane is also discussed. It may appear due to the spin-orbit interaction (DM effect). In this case, electric polarization must appear also in the ab plane.

1 October 2007 in JETP Letters

Journal Article

Equation of state and structural transition at high hydrostatic pressures in the BiFeO3 crystal

A. G. Gavriliuk

V. V. Struzhkin

Igor Lyubutin

I. A. Troyan

Change in the crystal structure of the BiFeO₃ multiferroic at high pressures up to 70 GPa in a diamond anvil cell has been studied by the method of synchrotron x-ray diffraction at room temperature. The experiment has been carried out under hydrostatic conditions with helium as a pressure-transferring medium. An anomaly has been observed in the behavior of the structural parameters at pressures P _c ≈ 40−50 GPa. This anomaly correlates with the effect of the magnetic collapse of iron moments revealed in this pressure range. It has been found that the bulk compression modulus is equal to B ₀ = (75.5 ± 15.5) GPa in the interval 0 < P < P _c and is almost quadrupled to a value of B = (292 ± 9) GPa in the interval P > P _c. When the pressure decreases, the behavior of the structural parameters is completely reversible in correlation with the reversibility of the magnetic transition. The “diffuseness” of the structural transition in pressure is explained by thermal fluctuations between the high-and low-spin states of Fe³⁺ ions in the transition region.

9 November 2018 in Inorganic Chemistry

Journal Article

Mechanism of Transformation of Ferrocene into Carbon-Encapsulated Iron Carbide Nanoparticles at High Pressures and Temperatures

Ludmila F. Kulikova

Vyacheslav N. Agafonov

2 October 2017 in Inorganic Chemistry

Journal Article

Structural, Magnetic, and Electronic Properties of Mixed Spinel NiFe_2–xCr_xO₄ Nanoparticles Synthesized by Chemical Combustion

About Me

Experience and Positions held: 2004 – present- Professor of Physics, Doctor of Sciences, Head of the Department of Nuclear Methods and Magnetic Structures at the Subnikov Institute of Crystallography, Russian Academy of Sciences (ICRAS), Moscow, Russia. 1998 – 2004 Deputy Director of the Subnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, Russia 1983 – 1992 Head of Department of the Low Temperature Physics at ICRAS. Moscow, Russia 1966 – 1983 The junior, senior, leading research scientist, Associate Professor, the Group leader, Full Professor in the Subnikov Institute of Crystallography, Russian Academy of Sciences. 1962 - 1965 PhD course at the Moscow State University and at the Institute of Crystallography, USSR Academy of Sciences. Present Position: Professor of Physics, Doctor of Sciences, Full Member (Academician) of the Russian Academy of Natural Sciences, The Honored Scientist of Russian Federation, Head of the Department of Nuclear Methods and Magnetic Structures at the Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences (IC-FSRC-CP-RAS), Moscow, Russia. Address: Shubnikov Institute of Crystallography, FSRC “Crystallography and Photonics” Russian Academy of Sciences, Leninsky av. 59, Moscow 119333, Russia Tel. (7499) 135 6250 Fax: (7499) 135 1011 E-mail: lyubutinig@mail.ru

Prof. Igor Lyubutin

Prof. Igor Lyubutin

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