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    Wyświetlanie 1-8 z 8
    Tytuł:
    Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB₆
    Autorzy:
    Semeno, A.
    Gilmanov, M.
    Sluchanko, N.
    Krasnorussky, V.
    Shitsevalova, N.
    Filipov, V.
    Flachbart, K.
    Demishev, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032654.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    76.30.Kg
    Opis:
    Angular dependences of ESR line parameters (g-factor and linewidth Δ H) were experimentally explored in the antiferroquadrupolar phase of heavy fermion system CeB₆ at T=1.8 K. The data were obtained in two experimental geometries with different mutual directions of the wavevector k and the external magnetic field H at frequency of f=60 GHz. A g-factor anisotropy was found: while g-factors for [110] and [111] directions are close to each other (g ≈1.6), it is considerably higher (g ≈1.75) for [100]. The obtained angular dependence g(Θ) was compared with the theoretically predicted g-factor behavior for the Γp₈ state of Ce³⁺ ion in antiferroquadrupolar phase of CeB₆. It turns out that the experimental g-factor is considerably smaller at all angles than the theoretically calculated limits (2
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1060-1062
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance Anisotropy and Magnetic H-T Phase Diagram of $Tm_{0.996}Yb_{0.004}B_{12}$
    Autorzy:
    Sluchanko, N.
    Azarevich, A.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Gavrilkin, S.
    Gabani, S.
    Flachbart, K.
    Shitsevalova, N.
    Filipov, V.
    Vanacken, J.
    Moshchalkov, V.
    Stankiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371466.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    73.43.Qt
    75.30.Kz
    75.20.Hr
    75.50.Ee
    Opis:
    The antiferromagnetic ground state has been studied by transverse magnetoresistance, heat capacity and magnetization measurements, which were carried out on high quality single crystals of $Tm_{0.996}Yb_{0.004}B_{12}$ dodecaboride in strong magnetic fields at liquid helium temperatures. Both antiferromagnetic-paramagnetic (AF-P) and spin-orientation (AF1-AF2) phase transitions have been observed, and allowed to construct a complicated magnetic H-T phase diagram for this compound. Strong magnetoresistance anisotropy was found both in AF states (ρ(H||[110])/ρ(H||[111])~ 1.2 at H~ 20 kOe) and at the critical field of AF-P transition $(H_{N}[100]$/$H_{N}[111]$~ 1.25) in this magnetic metal with a simple fcc crystal structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 332-333
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge Transport and Magnetism in $Tm_{0.03}Yb_{0.97}B_{12}$
    Autorzy:
    Glushkov, V.
    Azarevich, A.
    Anisimov, M.
    Bogach, A.
    Demishev, S.
    Dukhnenko, A.
    Filipov, V.
    Flachbart, K.
    Gabáni, S.
    Gavrilkin, S.
    Kondrin, M.
    Shitsevalova, N.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398286.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    72.15.Jf
    71.27.+a
    Opis:
    Transport and magnetic properties of polycrystalline $Tm_{0.03}Yb_{0.97}B_{12}$ samples were investigated at temperatures 1.8-300 K in magnetic fields up to 9 T. The activated behavior of resistivity, the Hall coefficient and thermopower is described in terms of a narrow gap $ε_g$ ≈ 16.6 meV, which controls the charge transport in $Tm_{0.03}Yb_{0.97}B_{12}$ at T>40 K. The maximum of magnetic susceptibility found at 50 K is shown to be induced by a spin gap Δ ≈ 4.7 meV being close to the half of the spin fluctuation energy in YbB₁₂. Large diffusive thermopower S=AT, A=-29.1 μV/K² and the Pauli susceptibility χ₀ ≈ 7.2×10¯³ emu/mol found below 20 K seem to be associated with the many-body resonance, which corresponds to states with an enhanced effective mass m* ≈ 250m₀ (m₀ - free electron mass). The effective parameters of magnetic centers and the analysis of anomalies favor the nonequivalent states of substitute Tm ions.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 985-987
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of the charge transport in GdB₆
    Autorzy:
    Anisimov, M.
    Glushkov, V.
    Bogach, A.
    Demishev, S.
    Samarin, N.
    Samarin, A.
    Shitsevalova, N.
    Levchenko, A.
    Filipov, V.
    Gábani, S.
    Flachbart, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052920.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    Opis:
    The anisotropy of charge transport was investigated in the antiferromagnetic II state of GdB₆ from precise measurements of transverse magnetoresistance. Based on the data obtained we detected a complicated behavior of magnetoresistance curves which are characterized by the appearance of considerable hysteresis on the field and angular dependences below T_{N2}. Moreover it was shown that the system GdB₆ is sensitive to cooling-warming prehistory. The data analysis allowed to reconstruct magnetic H-T phase diagram of GdB₆ along main crystallographic directions (H||⟨001⟩,⟨110⟩,⟨111⟩) and to propose additional phase transition inside AF II phase at H₁ ≈ 0.5 T.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 973-975
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Drag and Magnetic Anomalies of Thermopower in $RB_{12}$ (R = Ho, Er, Tm, Lu)
    Autorzy:
    Glushkov, V.
    Demishev, S.
    Ignatov, M.
    Khayrullin, E.
    Sluchanko, N.
    Shitsevalov, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813647.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Jf
    75.50.Ee
    Opis:
    High precision measurements of the Seebeck coefficient S(T) were carried out on the single crystals of $RB_{12}$ (R = Ho, Er, Tm, Lu) at temperatures 2-300 K. It was shown that the effects of phonon drag result from vibrations of rare earth ions ($ħω_E$≈10-33 meV) in the rigid framework structure of the $B_{12}$ clusters and determine the main contribution to thermopower at intermediate temperatures (30-300 K). The correlated behavior of transport parameters favors the appreciable enhancement of spin fluctuations in the sequence of magnetic compounds $(HoB_{12}-TmB_{12})$ when approaching to the valence instability state in $YbB_{12}$. The giant increase in S(T) detected in the vicinity of the Néel temperature $T_N$ for $HoB_{12},$ $ErB_{12},$ and $TmB_{12}$ seems to result from the density of states renormalization caused by antiferromagnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 275-278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of Magnetoresistance in HoB₁₂
    Autorzy:
    Khoroshilov, A.
    Krasnorussky, V.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Levchenko, A.
    Shitsevalova, N.
    Filipov, V.
    Gabáni, S.
    Flachbart, K.
    Anisimov, M.
    Siemensmeyer, K.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032153.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    Opis:
    We present results of precision measurements of magnetoresistance of isotopically pure Ho¹¹B₁₂ at low temperatures 2÷10 K in magnetic field up to 80 kOe of different orientation to the crystal axes. The data obtained revealed strong anisotropy of magnetoresistance and allowed us to reconstruct magnetic H-T phase diagrams for main crystallographic directions H || [001], [110], and [111]. Analysis of magnetoresistance derivatives allowed to conclude in favor of two main magnetoresistance contributions. Among of them the negative quadratic component is attributed to charge carriers scattering on a magnetic clusters of Ho³⁺ ions (4f component) and positive linear one may be explained in terms of scattering on a spin density waves (5d component).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 976-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bulk and Local Magnetic Susceptibility of $ErB_{12}$
    Autorzy:
    Bogach, A.
    Bogomolov, L.
    Glushkov, V.
    Demishev, S.
    Sluchanko, D.
    Sluchanko, N.
    Shitsevalova, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813645.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Eb
    75.50.Ee
    Opis:
    High precision measurements of magnetoresistance Δρ/ρ = f(T,H) and magnetization M(T,H) were carried out on single crystals of rare-earth dodecaboride $ErB_{12}$ at temperatures in the interval 1.8-30 K in magnetic fields up to 70 kOe. The high accuracy of the experiments allowed us to perform numerical differentiation and analyze quantitatively the behavior of the derivative d(Δρ/ρ)/dH = f(T,H) and of the magnetic susceptibility χ(T,H) = dM/dH in paramagnetic and magnetically ordered (antiferromagnetic, $T_N$ ≈ 6.7 K and $T_M$ ≈ 5.85 K) phases of $ErB_{12}$. It was shown that negative magnetoresistance anomalies observed in present study in paramagnetic state of $ErB_{12}$ may be consistently interpreted in the framework of a simple relation between resistivity and magnetization -Δρ/ρ ~ $M^2$.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 271-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge Transport and Magnetism in $Eu_{1-x}Ca_{x}B_6$
    Autorzy:
    Glushkov, V.
    Anisimov, M.
    Batko, I.
    Batkova, M.
    Bogach, A.
    Demishev, S.
    Filipov, V.
    Flachbart, K.
    Kuznetsov, A.
    Sannikov, I.
    Shitsevalova, N.
    Sluchanko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534292.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    75.30.Cr
    75.40.-s
    75.47.Gk
    Opis:
    Transport, magnetic and thermal properties of substitutional solid solution $Eu_{1 - x}Ca_{x}B_6$ single crystals (0 ≤ x ≤ 0.244) have been studied at 1.8 ≤ T ≤ 300 K and in magnetic fields up to 8 T. Calcium doping is shown to result in a metal-insulator transition, which occurs at x_{MIT} ≈ 0.2. In vicinity of metal-insulator transition the effect of colossal magnetoresistance is found to be very sensitive to Ca content, the amplitude varying from Δ = [ ρ (0)- ρ (8T)]/ρ(8T) ≈1.4 × $10^2$ to Δ ≈ 7.5 × $10^3$ for 0.14 ≤ x ≤ 0.16. The analysis of magnetic contribution to heat capacity shows that a large amount of magnetic entropy ( ≈ 30%) releases in $Eu_{0.845}Ca_{0.155}B_6$ when moving from the Curie temperature $T_{C}$ ≈ 5.5 K to the characteristic one T* ≈ 30 K. This observation as well as the large amplitude of low field colossal magnetoresistance effect and the deviation of magnetic susceptibility from the Curie-Weiss law detected for x = 0.155 compound in the interval $T_{C}$ ≤ T ≤ T* seem to be associated with magnetic phase separation induced by Ca doping.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 891-892
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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