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Wyświetlanie 1-15 z 21
Tytuł:
Magnetic Properties of $URu_{1-x}Pd_{x}Ge$ Solid Solutions
Autorzy:
Gralak, D.
Zaleski, A.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1371286.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.30.-m
75.50.-y
Opis:
The magnetic properties of the solid solutions $URu_{1-x}Pd_{x}Ge$ with x = 0.1 - 0.9, crystallizing in the orthorhombic TiNiSi-type structure, were investigated by ac magnetic susceptibility and dc magnetization measurements. The experimental data reveal that there are three different regions of magnetic behaviour. A nonmagnetic ground state occurs for x < 0.3, however, as the Pd concentration is increased, the antiferromagnetism is stabilized for x=0.35 - 0.8, and two successive transitions, antiferro- and ferromagnetic, emerge in the x=0.9 composition.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 314-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Phase Transition in $CePd_{2}P_{2}$
Autorzy:
Tran, V.
Bukowski, Z.
Tran, L.
Zaleski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1371474.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.40.Gb
71.27.+a
Opis:
The tetragonal $CePd_{2}P_{2}$ compound has been investigated by ac magnetic susceptibility and dc magnetization measurements. The experimental data reveal a ferromagnetic phase transition at $T_{C}$=28.4± 0.2 K. Using Arrot-Noakes plot and scaling laws for a second-order phase transition, critical exponents for the ferromagnetic transition in the system were obtained. The critical exponents are located between those of the mean field and Heisenberg model values.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 334-335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nano-SiC Doping on the Superconducting Critical Parameters in $MgB_2$/Fe Wires and Tapes
Autorzy:
Gajda, D.
Zaleski, A.
Morawski, A.
Kario, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813696.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Ad
74.25.Sv
Opis:
In this paper the results of critical current measurements for $MgB_2$ wires and tapes in iron sheath with and without nano-SiC doping are presented. We focus on power-in-tube processing technique, using both in situ and ex situ methods. In situ $MgB_2$ wires and tapes were fabricated from $MgH_2$ and B or Mg and B powders. The methods such as hydrostatic extrusion and rolling were used. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750°C and 1.0 GPa for 40 min. It was found that critical current of $MgB_2$/Fe superconducting wire or tape with nano-SiC dopant increased in higher magnetic field values in comparison to pure $MgB_2$. A significant difference of $J_c$ in tapes made by in situ way from $MgH_2$ and Mg were found.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 371-374
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Ex Situ $MgB_2$ Barrier and HIP on the $I_c$ Anisotropy in Double Core $MgB_2//Cu$ Wires
Autorzy:
Gajda, D.
Morawski, A.
Zaleski, A.
Cetner, T.
Powiązania:
https://bibliotekanauki.pl/articles/1535516.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Opis:
The effect of large $I_{c}$ anisotropy reductions in $MgB_2//Cu$ sheathed wire is presented. The measurements of the critical current in rising magnetic field up to 14 T at 4.2 K were performed. Due to the application of the high isostatic pressure process to the copper sheathed $MgB_2$ wires with the ex situ $MgB_2$ homo barrier around the in situ core the anisotropy for such wires was very small and approached to less than 2% at magnetic field over 4 T. The presented geometry and technology show several advantages in their practical applications.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1059-1061
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spontaneous Surface Magnetisation of Single Crystal MnF$\text{}_{2}$ in the Antiferromagnetic State
Autorzy:
Nizhankovskii, V. I.
Khar'kovskii, A. I.
Zaleski, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/2013077.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Pd
75.25.+z
75.50.Ee
Opis:
Spontaneous magnetisation of (100) and (010) surfaces of a MnF$\text{}_{2}$ single crystal in the antiferromagnetic state is discovered. A sign of the surface magnetisation is determined by a difference in dielectric constants ε of MnF$\text{}_{2}$ and ambient matter: magnetisation is directed to the substance with a smaller ε.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 487-490
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Magnetic Field Distribution in the Bi2212 superconducting Single Crystal by the Scanning EPR-Probe
Autorzy:
Drulis, H.
Folcik, L.
Drulis, M.
Zaleski, A.
Suleimanov, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/1968771.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
76.30.-v
Opis:
The profile of the magnetic field distribution over the surface of superconducting sample is studied by the scanning an electron paramagnetic resonance microprobe. The magnetic field distribution is mapped from the measurements of the spin probe EPR-signal shift.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 403-407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Critical Temperature of Homologous Series of High-T$\text{}_{c}$ Cuprates as a Function of Number of Layers
Autorzy:
Zaleski, T. A.
Kopeć, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/2038383.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.-z
74.72.-h
74.50.+r
Opis:
We have considered a model of n-layer high-temperature cuprates of homologous series like HgBa$\text{}_{2}$Ca$\text{}_{n-1}$Cu$\text{}_{n}$O$\text{}_{2+2n+δ}$ to determine the dependence of the critical temperature T$\text{}_{c}$(n) on the number n of Cu-O planes in an elementary cell. Focusing on the description of the high-temperature superconducting system in terms of the collective phase variables, we have studied a semi-microscopic anisotropic three-dimensional vector XY model of stacked copper-oxide layers with adjustable parameters representing microscopic in-plane and out-of-plane phase stiffnesses. The model captures the layered composition and block structure along c-axis of superconducting homologous series. Implementing the spherical closure relation we have solved the phase XY model exactly with the help of transfer matrix method for vector variables. The calculated dependence of the critical temperature T$\text{}_{c}$(n) on the block size n is monotonic with n.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 561-567
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Existence of the 60 K Plateau in the YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ Phase Diagram: the Role of Oxygen Ordering and Charge Imbalance
Autorzy:
Zaleski, T. A.
Kopeć, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/2047332.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.20.-z
74.72.Bk
74.62.-c
Opis:
We propose a semi-microscopic model of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ to investigate the origin of the 60 K plateau in its phase diagram. Our model is a "phase only" approach to the high-temperature superconducting system in terms of collective variables. It is able to capture characteristic energy scales present in YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ by using adjustable parameters representing phase stiffnesses and allows for strong anisotropy within basal planes to simulate oxygen ordering. We solve the model calculated T$\text{}_{c}$ for chosen system parameters investigating the influence of oxygen ordering and doping imbalance on the shape of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ phase diagram. Our results suggest that the oxygen ordering alone does not seem to be responsible for the existence of the 60 K plateau. However, relying on experimental data unveiling that oxygen doping of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ may introduce a significant charge imbalance between CuO$\text{}_{2}$ planes and other sites, we show that simultaneously the former are underdoped, while the latter - strongly overdoped almost in the whole region of oxygen doping in which YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{6+y}$ is superconducting. This provides two natural counter acting factors, which possibly lead to rise the 60 K plateau with increasing oxygen doping.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 705-711
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer, XRD, and SEM Study of FeAl-Based Powder Alloys with Nanoinclusions
Autorzy:
Zaleski, A.
Fedotova, J.
Ilyuschenko, A.
Talako, T.
Belyaev, A.
Letsko, A.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2046435.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
81.20.Ev
82.80.Ej
Opis:
Peculiarities of phase composition and morphology in nanostructured (Fe$\text{}_{70}$Al$\text{}_{30}$)$\text{}_{1-x}$(Al$\text{}_{2}$O$\text{}_{3}$)$\text{}_{x}$ (x=64-80 wt.%) powder alloys prepared by self-propagated high temperature synthesis have been studied by $\text{}^{57}$Fe transmission Mössbauer spectroscopy, scanning electron microscopy, and X-ray diffraction. It has been established that phase composition of alloys has not been affected by Al$\text{}_{2}$O$\text{}_{3}$ contribution. Contrary, atomic arrangement in B2 FeAl phase depends on the volume fraction of Al$\text{}_{2}$O$\text{}_{3}$ resulting in the migration of Al atoms from B2 FeAl lattice.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 441-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconductivity and Magnetism of $Dy_{1-x}Y_xRh_4B_4$: Candidate for Spin-Triplet Cooper Pairing
Autorzy:
Dmitriev, V.
Zaleski, A.
Khlybov, E.
Rybaltchenko, L.
Khristenko, E.
Ishchenko, L.
Terekhov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812277.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Ad
Opis:
In this work for the first time we give the evidence that compound $Dy_{1-x}Y_x Rh_4B_4$ with the tetragonal body-centered crystal structure $LuRu_4B_4$ is the ferrimagnetic at temperatures $T_{Cur}$<40 K, ferrimagnetic superconductor at $T_C$ <10 K and antiferromagnetic superconductor at $T_N$ <3 K. No reentrant behavior was found down to T = 0.32 K. For the first time by means of a method of microcontact spectroscopy of the Andreev reflection in point contact$ Ag-Dy_{0.8}Y_{0.2}Rh_4B_4$ the value and temperature and field dependences of superconducting gap parameter∆(T, H) in $Dy_{0.8}Y_{0.2}Rh_4B_4$ were determined. The value of the ratio 2∆(0)/k$T_C$ is about 4. Some unusual features of∆(T, H) dependences were observed, which give the evidence that the $Dy_{1-x}Y_xRh_4B_4$ is a candidate for spin-triplet Cooper pairing of charges with the parallel spins.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 83-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pinning Force in Superconducting Wires Nb-Ti
Autorzy:
Gajda, D.
Zaleski, A.
Dyakonov, V.
Matrosov, N.
Szymczak, H.
Beloshenko, V.
Spuskanyuk, V.
Chishko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1537076.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.71.Mn
Opis:
In the paper we present the results of the measurements of critical current $I_{c}$ in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density $J_{c}$.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 364-365
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting and Microstructural Properties of (Mg+2B)+MgB$\text{}_{2}$/Cu Wires Obtained by High Gas Pressure Technology
Autorzy:
Kario, A.
Morawski, A.
Głowacki, B. A.
Łada, T.
Smaga, M.
Diduszko, R.
Kolesnikov, D.
Zaleski, A. J.
Kondrat, A.
Gajda, D.
Powiązania:
https://bibliotekanauki.pl/articles/2047331.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.71.Mn
Opis:
In order to improve the overall critical current characteristics of Cu sheathed in situ MgB$\text{}_{2}$ wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB$\text{}_{2}$ chemical barrier between ex situ core and Cu, suppressing the reaction of Cu with Mg. Wires, doped with 10 at.% SiC of 18 nm average grain size, were fabricated from MgH$\text{}_{2}$ and B or from Mg and B powders, using the powder-in-tube method. The methods of rotary swaging or drawing were used as the alternating wire-forming processes. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750ºC and 1.0 GPa for 15 and 30 min. A significant difference in Cu distribution across the wires for a long and short time of sintering was observed. The formation of microstructure in the powder-in-tube process and the relationship between the microstructure and critical current density J$\text{}_{c}$ values, are discussed in this paper.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 693-703
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Impulse Shot Peening Parameters on Properties of Stainless Steel Surface
Autorzy:
Wiertel, M.
Zaleski, K.
Gorgol, M.
Skoczylas, A.
Zaleski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1033967.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.-b
81.20.Wk
62.20.Qp
61.72.-y
78.70.Bj
Opis:
Shot peening was applied to austenitic stainless steel 1.4541 (EN). The surface treatment was performed at various impact energies E, impact densities j and ball diameters D. This resulted in improved microhardness, which increases monotonically with the increase of E, j and 1/D. However, its changes with E and j achieve saturation at about 400 HV0.1. On the contrary, no saturation is observed in the investigated range for 1/D. In the un-shot peened 1.4541 (EN) steel, the lifetime component of low intensity was found with use of positron annihilation lifetime spectroscopy (PALS). It corresponds to positron annihilation from delocalized state of positrons in bulk. In the shot peened samples the bulk component is no longer observed. Instead, two types of defects can be identified: vacancy-like defects coupled with edge dislocations and vacancies or their small clusters (consisting 3÷5 vacancies). The results of PALS and hardness testing do not correspond very well, especially in the case of the samples shot peened with balls of varying diameters. The most probable reason for this are different depth profiles of both methods. It seems that the defects, which are responsible for the increase of static microhardness above 400 HV0.1 are located mostly below the surface layer penetrated by positrons.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1611-1615
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porosity of Silica Monoliths with Tailored Mesopores of Ink-Bottle Shape Determined by Nitrogen Adsorption and Positron Annihilation Lifetime Spectroscopy
Autorzy:
Sienkiewicz, A.
Kierys, A.
Gorgol, M.
Zaleski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1033934.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Rm
68.43.-h
81.70.-q
78.70.Bj
36.10.Dr
Opis:
The comparison of pore size distributions obtained with the use of two porosimetric methods: low temperature nitrogen sorption (LN2) and positron annihilation lifetime spectroscopy (PALS), was performed for porous silica monoliths. Four investigated samples were prepared under various synthesis conditions. Nitrogen sorption showed the presence of bottle-shaped pores in all investigated samples. In addition, it seems that the presence of methanol during synthesis influences porosity to a greater extent than organic additives. Quite good agreement between the LN2 and PALS results was observed only for the silica monolith synthesized with β-cyclodextrins as pore directing agent. The biggest discrepancy in the results obtained from these two techniques was observed for the silica gel synthesized with no additives. The origin of such discrepancies, taking into account the shape of pore size distribution and deficiencies of data analysis techniques, is discussed.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1568-1571
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film
Autorzy:
Bonda, A.
Uba, S.
Załęski, K.
Dubowik, J.
Uba, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030478.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.78.Jp
75.50.-y
78.47.J-
75.30.-m
06.60.Jn
75.40.Gb
Opis:
The work is devoted to studies of ultrafast magnetization dynamics induced by femtosecond laser pulses in ferromagnetic Ni-Mn-Sn shape memory Heusler alloy. We studied epitaxial thin Ni_{54.3}Mn_{31.9}Sn_{13.8} film deposited on (001) MgO substrate. Spin precession in an external magnetic field was triggered and detected by the time-resolved magneto-optical Kerr effect (TRMOKE) using pump-probe technique in dual color scheme experiment. Measurements were performed as a function of magnetic field H and pulse power P. The measured TRMOKE signal is composed of oscillatory and background components, both decaying exponentially in a nanosecond time scale. The precession frequency was determined and found to be varying in the range of 1-10 GHz with H up to 3 kOe and decreasing linearly with P. The dependence of Gilbert damping parameter α on H was determined and discussed.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 501-504
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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