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Wyświetlanie 1-9 z 9
Tytuł:
Quantum Interference in Disordered Ferromagnet U₂NiSi₃
Autorzy:
Gnida, D.
Szlawska, M.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1386551.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.-v
75.50.Lk
72.15.Rn
Opis:
A single-crystalline sample of disordered ferromagnetic U₂NiSi₃ was investigated by means of electrical resistivity measurements under ambient and high hydrostatic pressure. Temperature dependences of the electrical resistivity clearly reveal interplay of the ferromagnetic ordering and quantum interference effects resulting from crystallographic disorder. Electron-electron interaction manifests itself as a $T^{0.5}$ increase in the in-plane and out-of-plane electrical resistivity below 5 K. Weak localization is observed solely in the ab-plane as a linear-in-T contribution to resistivity, which suggests that internal magnetic field does not break the interference of scattered electron waves in ab-plane. Applied hydrostatic pressure does not affect the $T^{0.5}$ electron-electron interaction contribution, however it diminishes the impact of weak localization on the ab-plane resistivity.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 451-453
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Transport Properties of Possibly Topologically Nontrivial Half-Heusler Bismuthides RMBi (R = Y, Gd, Dy, Ho, Lu; M = Pd, Pt)
Autorzy:
Pavlosiuk, O.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398607.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
72.15.Jf
Opis:
High quality single crystals of some representatives of half-Heusler family were grown from Bi-flux. For single crystals characterization, X-ray diffraction and scanning electron microscopy techniques were used. The low-temperature physical properties of the synthesized crystals were determined by means of magnetization, magnetic susceptibility, electrical resistivity and heat capacity measurements. For each compound but LuPtBi, the electrical resistivity varies in a semimetallic manner at high temperatures, and exhibits a metallic character at low temperatures. LuPtBi is metallic in the whole temperature range studied. The bismuthides HoPdBi, LuPdBi, LuPtBi and YPtBi were found superconducting below the critical temperature $T_{c}$ = 0.7, 1.8, 0.9, and 0.96 K, respectively. For the compounds GdPdBi, DyPdBi and HoPdBi, an antiferromagnetic ordering was found to set in below $T_{N}$ = 12.8, 3.7, and 1.9 K, respectively. HoPdBi is thus an intriguing material in which both cooperative phenomena coexist.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 573-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Electronic Properties in Series of $GdT_{x}Ga_{4-x}$ Solid Solutions (T = Ni or Cu)
Autorzy:
Wiśniewski, P.
Gorzelniak, R.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1385707.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
72.15.-v
72.15.Jf
Opis:
We present results of extensive measurements of magnetic susceptibility, electrical resistance, specific heat and thermoelectric power of two series of solid solutions $GdNi_{x}Ga_{4-x}$ and $GdCu_{x}Ga_{4-x}$, for ranges of doping x from 0.6 to 1 and from 1 to 1.5, respectively. All studied phases display the Curie-Weiss behaviour of magnetic susceptibility and antiferromagnetic ordering at temperatures below 23 K. Substitution of gallium with transition metal atoms has strong influence on Néel temperatures of all studied phases, shifting them by few K, depending on x. Metamagnetic-like anomalies are observed for some compositions. Behaviour of the electrical resistivity reveals metallic nature of all samples. Their magnetic ordering is reflected in low-temperature anomalies of the resistivity and the heat capacity.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 382-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antiferromagnetic order in the half-Heusler phase TbPdBi
Autorzy:
Pavlosiuk, O.
Kleinert, M.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1047687.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.80.+q
71.55.Ak
72.15.Eb
Opis:
Single crystals of TbPdBi, a representative of the group of half-Heusler bismuthides, were studied by means of magnetic susceptibility, heat capacity, electrical resistivity, magnetostriction and thermal expansion measurements. The compound was characterized as an antiferromagnet with the Néel temperature T_{N} ≈5.3 K. Neutron diffraction experiment confirmed the antiferromagnetic ordering and yielded the propagation vector k=(1/2,1/2,1/2). Remarkably, this k vector is in accord with the recently developed theory of antiferromagnetic topological insulators.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 498-500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi
Autorzy:
Pavlosiuk, O.
Filar, K.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1388106.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.10.+v
75.40.Cx
71.18.+y
71.20.Eh
72.15.Gd
Opis:
Single crystals of ErPdBi were grown from Bi-flux. The crystal structure of MgAgAs-type was confirmed using X-ray diffraction. Magnetization, magnetic susceptibility, electrical resistance and heat capacity measurements revealed an antiferromagnetic phase transition at $T_{N}$ = 1.2 K. At high temperatures, the electrical resistance has a semiconducting-like character (dR/dT < 0 ). The resistance starts decreasing with decreasing T below 15 K and shows a very sharp drop below $T_{N}$ but remains finite down to 0.4 K. Hence, no obvious evidence of superconductivity was found in the electrical transport data. On the other hand, the real part of AC magnetic susceptibility is negative below $T_{C}$ = 1.6 K and its imaginary component has a clear maximum at this temperature that might be associated with the onset of superconducting state. The electrical resistance revealed Shubnikov-de Haas oscillations in magnetic fields 8-33 T. Their amplitude decreases with increasing T and disappears above 10 K. Cyclotron mass determined from this dependence is 0.21 $m_{e}$.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 656-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoresistance and Shubnikov-de Haas Effect in LuSb
Autorzy:
Kleinert, M.
Pavlosiuk, O.
Swatek, P.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030528.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
Opis:
Single-crystals of LuSb were investigated by means of electrical resistivity and magnetoresistance measurements. The compound was found to exhibit giant magnetoresistance exceeding 3000%, low-temperature resistivity plateau, and Shubnikov-de Haas oscillations. It was characterized as a semimetal with nearly balanced contributions of electron and hole carriers to the magnetotransport properties. The experimental findings, supported by the results of electronic structure calculations, proved that the magnetotransport in LuSb can be described in the scope of 3D multi-band Fermi surface model without topologically non-trivial electronic states.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena czasu suszenia pierwszej i drugiej warstwy ceramicznej formy odlewniczej z wykorzystaniem kamery termowizyjnej
Thermovisual estimation of the time necessary for drying the two outer layers of a ceramic casting die
Autorzy:
Koralnik, M. K.
Wiśniewski, P.
Moszczyńska, D.
Sitek, R.
Mizera, J.
Powiązania:
https://bibliotekanauki.pl/articles/168814.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
ceramiczne formy odlewnicze
masy formierskie
nano SiO2
suszenie
termowizja
odlewanie metodą traconego wosku
shell moulds
slurries
drying
thermovision
investment casting
Opis:
W artykule przedstawiono wyniki badań dotyczące oceny czasu suszenia przymodelowej oraz konstrukcyjnej warstwy ceramicznej formy odlewniczej. W celu wykonania pomiarów wytworzono dwie testowe masy lejne, które posłużyły do wytworzenia odpowiednio pierwszej oraz konstrukcyjnej warstwy formy ceramicznej. Do wykonania mas formierskich zastosowano proszki tlenku glinu i wodne spoiwo na bazie krzemionki koloidalnej. Mikrostrukturę proszków badano przy użyciu elektronowego mikroskopu skaningowego, natomiast rozmiar cząstek określono przy pomocy analizatora laserowego. Gęstwy, które wykorzystano do budowy badanych warstw ceramicznej formy odlewniczej, przygotowano w mieszadle mechanicznym. Ich parametry, takie jak: temperatura, pH, lepkość względna i dynamiczna, były odczytywane przez pięć dni z rzędu. Pomiary termowizyjne przeprowadzono w pomieszczeniu o kontrolowanej temperaturze i znanej wilgotności. Wykazano, że formy ulegają całkowitej dehydratacji w momencie osiągnięcia temperatury otoczenia.
The paper evaluates the drying time of two layers (model and constructional) of ceramic casting dies. The slurries were prepared using the aluminum oxide and a colloidal silica-based water binder. The constituents were examined in a scanning electron microscope (SEM), their particle size was determined in a LA-950 analyzer. Then, they were mixed in a mechanical mixer and the properties of the mixtures, such as the temperature, pH, as well as relative and dynamic viscosity were monitored using a thermo-visual camera during five consecutive days. After reaching the ambient temperature, the dies appeared to be fully dehydrated.
Źródło:
Szkło i Ceramika; 2017, R. 68, nr 1, 1; 6-10
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Providing Cloud-awareness to Clients DASH Application by Using DASH over HTTP/2
Autorzy:
Batalla, J. M.
Krawiec, P.
Negru, D.
Bruneau-Queyreix, J.
Borcoci, E.
Bęben, A.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/308126.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive video streaming
DASH
HTTP/2
Opis:
Mobile Cloud Networks group together mobile users and clouds containing content servers. Hence, they are an ideal framework for media content delivery. Streamswitching adaptive video players cope well with some limitations of Mobile Cloud Networks as low bandwidth and bandwidth variability in access network. Nonetheless, other limitations, as cloud congestion, are difficult to be managed by the video players. This paper presents a system for discovering fault situations at the cloud (e.g., cloud congestion) and notifying to the video player, which will take appropriate actions for saving the quality of media transmission. In proposed implementation the video application is DASH-capable and adaptation action may be both stream rate adaptation and content server adaptation. The communication between client and server uses "bidirectional" communication feature of HTTP/2 thanks to the new deployed modules running DASH over HTTP/2 in both client's and server's applications.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 4; 54-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Correlations of Donor Charges in MBE CdTe
Autorzy:
Suski, T.
Wiśniewski, P.
Litwin-Staszewska, E.
Wasik, D.
Przybytek, J.
Baj, M.
Karczewski, G.
Wojtowicz, T.
Zakrzewski, A.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934021.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
71.55.Gs
Opis:
We present experimental evidence that at high pressures indium donors in CdTe localize electrons in spatially correlated manner. We have studied Hall mobility, μ$\text{}_{H}$, as a function of electron concentration, n$\text{}_{H}$, at T=77 K. Changes of n$\text{}_{H}$ have been achieved by two methods. High pressure freeze-out of electrons onto localized states of In-donors leads to the mobility enhancement with respect to the situation when n$\text{}_{H}$ has been modified by means of a subsequent annealing of the sample. As a result, depending on the degree of spatial correlations in the impurity charges arrangement, different values of μ$\text{}_{H}$ correspond to the same value of n$\text{}_{H}$. The variation of mobility with electron concentration suggests that the localized state of In-donor represents likely negatively charged DX state.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 929-932
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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