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Wyszukujesz frazę "75.30.-m" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Magnetism in $NdMnO_{3+δ}$ Studied by the Single Crystal Neutron Diffraction
Autorzy:
Mihalik, M.
Maťaš, S.
Vavra, M.
Powiązania:
https://bibliotekanauki.pl/articles/1368766.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
75.30.-m
75.50.Gg
Opis:
We present the single crystal neutron diffraction experiment performed on the $NdMnO_{3+δ}$ compound. The aim of the experiment was to study/revisit the magnetic structure of the compound. We have confirmed the ordering of Mn sublattice below $T_{N}$=85.5 K and confirmed that the Nd sublattice orders below $T_{1}$ ≈ 20 K with Nd moments aligned parallel to the b-axis.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 284-285
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $La_{0.8}K_{0.2}MnO_{3}$ Nanoparticles
Autorzy:
Mihalik, M.
Zentková, M.
Briančin, J.
Fitta, M.
Lazúrová, J.
Vavra, M.
Powiązania:
https://bibliotekanauki.pl/articles/1371270.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.47.Lx
75.30.-m
75.30.Kz
Opis:
Magnetic properties of $La_{0.8}K_{0.2}MnO_{3}$ have been studied on nanoparticles prepared by glycine-nitrate method. Crystal structure and particles size were modified by heat treatment. Crystal structure changes from orthorhombic (space group Pbma) to rhombohedral (space group R-3c) after annealing at 600°C/2 hours. The average size of particle varies with annealing from about 30 nm to 135 nm. The Curie temperature $T_{C}$ and the saturated magnetization $μ_{s}$ increase with annealing. The exchange bias effect was observed on samples with particles size smaller than 60 nm.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 312-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Jahn-Teller Distortion on Double Exchange Interaction in $La_{0.8}K_{0.2}MnO_3$ Nanoparticles
Autorzy:
Mihalik, M.
Zentková, M.
Vavra, M.
Mihalik Jr., M.
Lazúrová, J.
Girman, V.
Konieczny, P.
Fitta, M.
Il'kovič, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398285.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.47.Lx
75.30.-m
75.30.Kz
Opis:
Electric resistance and effect of hydrostatic pressure on magnetic properties has been studied on the $La_{0.8}K_{0.2}MnO_3$ nanoparticles. Magnetic phase transition is affected by pressure only slightly, the Curie temperature $T_{C}$ decreases with the rate of -1.02 K/GPa, on samples with orthorhombic structure where the Jahn-Teller distortion of lattice is large. On the other hand, $T_{C}$ increases with the rate of 20.1 K/GPa on samples with rhombohedral structure, where the Jahn-Teller distortion of lattice is absent. Insulator type of electrical resistance is characteristic feature of sample with large Jahn-Teller distortion of lattice and insulator-metal transition was observed on samples where the Jahn-Teller distortion is negligible. Our results are in line with theoretical calculation predicting that double exchange interaction is suppressed by the Jahn-Teller distortion.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 875-877
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $NdFe_{0.9}Mn_{0.1}O_{3}$
Autorzy:
Zentková, M.
Lazúrová, J.
Kováč, J.
Mihalik, M.
Briančin, J.
Fitta, M.
Kusigerski, V.
Powiązania:
https://bibliotekanauki.pl/articles/1371226.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.47.Lx
75.30.-m
75.30.Kz
75.30.Et
75.30.Cr
Opis:
In our paper we study effect of Mn for Fe substitution on magnetic properties of $NdFe_{x-1}Mn_{x}O_{3}$ compounds for x=0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from $T_{N1}$=691 K to $T_{N1}$=621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution. Low temperature heat capacity measurement for sample with x=0.1 revealed that substitution of Mn for Fe shifts a Schottky-type anomaly at $T_{sh}$ to higher temperatures. Another anomaly is generated by doping at $T_{max}$=11 K. The anomaly is smeared out by magnetic field, confirming its magnetic origin.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 306-307
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of New U-Ni-X₂ Splats and Study of their Physical Properties
Autorzy:
Molčanová, Z.
Mihalik, M.
Reiffers, M.
Džubinská, A.
Huráková, M.
Kavečanský, V.
Paukov, M.
Havela, L.
Powiązania:
https://bibliotekanauki.pl/articles/1032182.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.82.Bg
75.50.Kj
75.30.-m
72.15.-v
Opis:
We explored the crystal structure, magnetic, and transport properties of UNiX₂ (X = Ge, Si) materials, which were prepared by a conventional metallurgical technique and by rapid solidification - splat cooling. The UNiSi₂ splat is mostly single phase, containing only small traces of a minority phase. Magnetic and electrical properties of the splat resemble properties of samples, which were prepared by conventional methods, exhibiting a ferromagnetic transition at about 91 K and similar temperature dependence of resistivity. The coercive field of μ₀H_c=4.25 T is much enhanced due to the magnetic anisotropy introduced by the sample preparation technique. The Barkhausen jumps were observed on the hysteresis loop. Magnetization of the sample does not saturate in fields up to μ₀H=9 T. The phase structure of UNiGe₂ splat is not completely solved and will be subject of our study in future. Our preliminary results indicate the presence of completely new phase with tetragonal crystal structure and antiferromagnetic ordering below 54 K.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 994-996
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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