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    Tytuł:
    Electrical and Magnetic Characterization οf $ZnCr_{2-x}V_{x}Se_{4}$ Spinel Semiconductors
    Autorzy:
    Duda, H.
    Malicka, E.
    Groń, T.
    Pacyna, A.
    Kusz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791367.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Jc
    75.50.Pp
    75.50.Dd
    Opis:
    Single crystals of $ZnCr_{2}Se_{4}$ spinel doped with vanadium were prepared by chemical vapour transport. The chemical compositions of three crystals have been determined by X-ray diffraction. The structure refinement using the SHELXL-93 program system determine the cation distribution in the system as $ZnCr_{2-x}V_{x}Se_{4}$. For x values equal to 0.03, 0.1 and 0.13 the observed symmetry was cubic, space group Fd3m. Based on the structural data, influence of the V ions on the magnetic and electrical properties has been analyzed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 962-963
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hopkinson-Like Effect in Single-Crystalline $CdCr_2Se_4$ and $Cd[Cr_{1.89}Ti_{0.08}]Se_4$
    Autorzy:
    Malicka, E.
    Groń, T.
    Pacyna, A.
    Duda, H.
    Krok-Kowalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489913.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Jc
    75.50.Pp
    75.50.Dd
    Opis:
    The static (dc) and dynamic (ac) magnetic measurements of $CdCr_2Se_4$ and $Cd[Cr_{1.89}Ti_{0.08}]Se_4$ showed their ferromagnetic properties with a Curie temperature $T_{C}$ ≈ 130 K and revealed on the real component of ac susceptibility curve, the peaks near $T_{C}$ at 200 Oe, 450 Oe and 1 kOe, characteristic for the Hopkinson ones. The meaningful reduction of saturation moment to 4.73 $μ_{B}$/f.u. for $Cd[Cr_{1.89}Ti_{0.08}]Se_4$ suggests the diamagnetic configuration of Ti ions, which dilutes the ferromagnetic sublattice of Cr ones and causes reducing of the energy losses visible on the imaginary components of ac susceptibility curve. Close for zero values of higher susceptibility harmonics above $T_{C}$ are pointing out to the lack of the spin fluctuations in the paramagnetic state.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 690-693
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature on Critical Fields in $Zn_{x}Sb_{y}Cr_{z}Se_{4}$
    Autorzy:
    Malicka, E.
    Groń, T.
    Duda, H.
    Pacyna, A.
    Krok-Kowalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791371.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    The electrical and complex ac dynamic magnetic susceptibility measurements were used to study an influence of temperature on critical fields in single-crystalline $Zn_{x}Sb_{y}Cr_{z}Se_{4}$ spinel system with y = 0.11, 0.16 and 0.20. The p-type conduction and a shift both of the Néel temperature $T_{N}$ to lower temperatures and a susceptibility peak at $T_{m}$ in the paramagnetic region - to higher temperatures were established. Below $T_{N}$ the magnetic field dependence of susceptibility, $χ_{ac}(H)$, shows two peaks. First peak at the critical field $H_{c1}$ slightly decreases with temperature and remains almost constant as Sb content increases. Second peak at the critical field $H_{c2}$ drops rapidly with temperature and remains almost unchanged as Sb content increases. At $T_{N}$ both critical fields disappear.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 964-966
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Properties of Sr₂InV₃O₁₁
    Autorzy:
    Groń, T.
    Filipek, E.
    Pacześna, A.
    Urbanowicz, P.
    Sawicki, B.
    Duda, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398582.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Pa
    72.80.Ga
    75.20.-g
    Opis:
    The electrical conductivity σ (T) and thermoelectric power S(T) measurements of Sr₂InV₃O₁₁ showed the insulating state and the change of sign of thermopower from p to n at $T_{n-p}$=400 K. The I-V characteristics provided the evidence of symmetrical and non-linear behaviour typical of strong emission of charge carriers induced by temperature and voltage. Relative dielectric permittivity $ε_{r}$ as well as loss tangent (tan δ) strongly depend both on the temperature in the range of 295-400 K and the frequency in the range of 5×10² to 1×10⁶ Hz, showing the broad maximum at 320 K. These effects are considered as a relaxation process like in the Maxwell-Wagner or Jonscher model as well as the conduction of electric current, as determined by the Joule-Lenz law.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1239-1241
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Magnetic Studies of $Zn_{x}Mn_{y}Cr_{z}Se_{4}$ p-Type Semiconductors
    Autorzy:
    Jendrzejewska, I.
    Groń, T.
    Duda, H.
    Zajdel, P.
    Pacyna, A.
    Maciążek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791347.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    The structural, electrical and magnetic investigations carried out on the $Zn_{x}Mn_{y}Cr_{z}Se_{4}$ polycrystals with y = 0.19, 0.29 and 0.38 revealed the spinel structure with the Mn ions occupying tetrahedral sites, p-type conduction with polaronic transport at high temperatures and antiferromagnetic order with a Néel temperature of 20 K and a Curie-Weiss temperature of 103 K. With increasing Mn content in a sample both the effective magnetic moment and the re-entrant temperature increase while the first and second critical fields connected with a metamagnetic transition and the breakdown of the conical spin arrangement decrease, respectively. These results are interpreted in terms of giant cubic anisotropy as well as an effect of Mn impurities on the screw structure of $ZnCr_{2}Se_{4}$.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 913-915
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Magnetic Studies of the $Cd_{x}Cr_{y}V_{z}Se_{4}$ Spinels
    Autorzy:
    Groń, T.
    Duda, H.
    Malicka, E.
    Zawisza, B.
    Krok-Kowalski, J.
    Pacyna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791407.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Jc
    75.50.Pp
    75.50.Dd
    Opis:
    The electrical and magnetic investigations carried out on the polycrystalline spinels with the general chemical formula $Cd_{x}Cr_{y}V_{z}Se_{4}$ (where z = 0.06, 0.12, 0.24, and 0.31) revealed semiconducting and ferromagnetic properties with a Curie temperature of 127.5 K. A step-like structure of the electrical conductivity, σ(T), was observed for the polycrystal containing 6% V ions in the octahedral sites while the remaining samples showed a typical Arrhenius behaviour of σ(T). These effects are interpreted in terms of ferromagnetic spin clusters which finally dissolve on going towards the paramagnetic limit including non-stoichiometry.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 969-970
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mictomagnetic Order in Cd$\text{}_{0.87}$Cr$\text{}_{1.93}$V$\text{}_{0.06}$Se$\text{}_{4}$ Semiconductor
    Autorzy:
    Groń, T.
    Malicka, E.
    Zawisza, B.
    Duda, H.
    Krok-Kowalski, J.
    Pacyna, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048136.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Jc
    75.50.Pp
    75.50.Dd
    Opis:
    The complex ac dynamic magnetic susceptibility was used to study the mictomagnetic-like behavior in polycrystalline Cd$\text{}_{0.87}$Cr$\text{}_{1.93}$V$\text{}_{0.06}$Se$\text{}_{4}$ spinel. The temperature dependences of the zero field in-phase (real part) and out-of-phase (imaginary part) components of fundamental susceptibility measured at the oscillating field H$\text{}_{ac}$ = 0.5 Oe and at the constant frequency of 125 Hz are characteristic for the mictomagnetic order. These results well correlate with the anomalies in the second and third harmonics of the ac susceptibility indicating the cluster glass.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 714-716
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Cu, Ga and Au Dopants and Technology Conditions on the Magnetic Interactions in $HgCr_2Se_4$ Single Crystals
    Autorzy:
    Krok-Kowalski, J.
    Władarz, G.
    Groń, T.
    Duda, H.
    Pacyna, A.
    Nikiforov, K.
    Rduch, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493008.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    For single crystals $HgCr_2Se_4$ doped by nonmagnetic $Cu^{+},$ $Au^{2+}$ and $Ga^{3+}$ ions and single crystals of $HgCr_2Se_4$ matrix growing in different synthesis conditions both the dc and ac magnetic susceptibility as well as the magnetization have been measured. As it follows from the analysis of the obtained results, paradoxically, the dopants strengthen the long range magnetic interactions of the ferromagnetically ordered single crystals under study, evidenced by the higher values of the ordering temperature in comparison with those ones for pure matrix. An influence of the technological processes connected with deficiency and/or excess of Hg on the long range magnetic interactions was not observed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 970-972
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cation Substitution on Critical Fields in the n-type $Zn_{x}Sn_{y}Cr_{z}Se_{4}$ Spinel Semiconductors
    Autorzy:
    Groń, T.
    Jendrzejewska, I.
    Maciążek, E.
    Pacyna, A.
    Duda, H.
    Zajdel, P.
    Krok-Kowalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791416.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    The ac dynamic magnetic susceptibility was used to study a cation substitution on critical fields in polycrystalline ($Zn_{0.87}Sn_{0.048})Cr_{2.02}Se_{4}$ and $Zn_{0.93}[Cr_{1.95}Sn_{0.05}]Se_{4}$ spinels with tetra- and octahedral coordination of Sn ions, respectively. An increasing static magnetic field shifts the Néel temperature $T_{N}$ to lower temperatures while a susceptibility peak at $T_{m}$ in the paramagnetic region - to higher temperatures. Below $T_{N}$ the magnetic field dependence of susceptibility, $χ_{ac}(H)$, shows two peaks at critical fields $H_{c1}$ and $H_{c2}$. The values of $H_{c1}$ decrease slightly with temperature while the values of $H_{c2}$ decrease strongly with temperature, especially for spinel with octahedral coordination of Sn ions, suggesting a weakness of the ferromagnetic component.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 971-974
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in $CuCr_{2}X_{4}$ ( rm X = S, Se) Spinels
    Autorzy:
    Malicka, E.
    Krok-Kowalski, J.
    Warczewski, J.
    Groń, T.
    Duda, H.
    Mydlarz, T.
    Pawełczyk, M.
    Pacyna, A.
    Rduch, P.
    Władarz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791401.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Kz
    75.30.Et
    Opis:
    Both the dc and ac magnetic susceptibilities as well as magnetization measurements were used to study the influence of the dilution of the magnetic chromium subarray by nonmagnetic antimony and aluminium ions on the magnetization processes for four spinel families under investigation. Substitution of the chromium ions by the nonmagnetic Sb and Al ions in the compounds under study leads to the very hard magnetization in the case of the compounds with Sb and very easy magnetization in the compounds with Al. This effect is connected with the electronic configurations of the Sb and Al ions as well as with ionic radii of these cations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 967-968
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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