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1
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Spontaneous Surface Magnetisation of Single Crystal MnF_{2} in the Antiferromagnetic State

100%
Nizhankovskii V., Khar'kovskii A., Zaleski A.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
487-490
EN
Spontaneous magnetisation of (100) and (010) surfaces of a MnF_{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_{2} and ambient matter: magnetisation is directed to the substance with a smaller ε.
2
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Magnetic Properties of URu_{1-x}Pd_{x}Ge Solid Solutions

100%
Gralak D., Zaleski A., Tran V.
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vol. 126
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issue 1
314-315
EN
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.
3
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The Influence of Ex Situ MgB_2 Barrier and HIP on the I_c Anisotropy in Double Core MgB_2/Cu Wires

100%
Gajda D., Morawski A., Zaleski A., Cetner T.
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issue 5
1059-1061
EN
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.
4
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Magnetic Phase Transition in CePd_{2}P_{2}

100%
Tran V., Bukowski Z., Tran L., Zaleski A.
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vol. 126
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issue 1
334-335
EN
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.
5
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Effect of Nano-SiC Doping on the Superconducting Critical Parameters in MgB_2/Fe Wires and Tapes

100%
Gajda D., Zaleski A., Morawski A., Kario A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
371-374
EN
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.
6
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Determination of the Magnetic Field Distribution in the Bi2212 superconducting Single Crystal by the Scanning EPR-Probe

88%
Drulis H., Folcik L., Drulis M., Zaleski A., Suleimanov N.
Acta Physica Polonica A
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1998
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vol. 93
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issue 2
403-407
EN
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.
7
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Content available

Mössbauer, XRD, and SEM Study of FeAl-Based Powder Alloys with Nanoinclusions

76%
Zaleski A., Fedotova J., Ilyuschenko A., Talako T., Belyaev A., Letsko A., Stanek J.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
441-444
EN
Peculiarities of phase composition and morphology in nanostructured (Fe_{70}Al_{30})_{1-x}(Al_2O_3)_x (x=64-80 wt.%) powder alloys prepared by self-propagated high temperature synthesis have been studied by ^{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_2O_3 contribution. Contrary, atomic arrangement in B2 FeAl phase depends on the volume fraction of Al_2O_3 resulting in the migration of Al atoms from B2 FeAl lattice.
8
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Superconductivity and Magnetism of Dy_{1-x}Y_xRh_4B_4: Candidate for Spin-Triplet Cooper Pairing

76%
Dmitriev V., Zaleski A., Khlybov E., Rybaltchenko L., Khristenko E., Ishchenko L., Terekhov A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
83-90
EN
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)/kT_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.
9
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Content available

Superconducting and Microstructural Properties of (Mg+2B)+MgB_2/Cu Wires Obtained by High Gas Pressure Technology

64%
Kario A., Morawski A., Głowacki B., Łada T., Smaga M., Diduszko R., Kolesnikov D., Zaleski A., Kondrat A., Gajda D.
Acta Physica Polonica A
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2007
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vol. 111
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issue 5
693-703
EN
In order to improve the overall critical current characteristics of Cu sheathed in situ MgB_2 wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB_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_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_c values, are discussed in this paper.
10
Content available remote

Pinning Force in Superconducting Wires Nb-Ti

64%
Gajda D., Zaleski A., Dyakonov V., Matrosov N., Szymczak H., Beloshenko V., Spuskanyuk V., Chishko V.
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issue 2
364-365
EN
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}.
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