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1
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Electron Spin Resonance Study of Nd^{3+} and Er^{3+} Ions in YAlO_{3}

100%
Jabłoński R., Frukacz Z.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
339-343
EN
In this paper we present the results of ESR and photo-ESR measurements on YAlO_{3}(YAP) single crystals and powder samples doped purposely with about 1 at.% Nd^{3+} and undoped crystals in which Er^{3+} was observed as residual dopant. The ESR measurements were carried out at X-band spectrometer in 4-300 K temperature range. The photo-ESR was performed at 5 K using a mercury arc lamp. For the Nd^{3+} doped crystals the intensity of ESR signal decreased about 2 times during illumination conditions. Moreover, the calculations of the g tensor and A hyperfine structure parameters for Nd^{3+} and Er^{3+} were carried out.
2
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Electron Spin Resonance Spectra of Fe^{3+} Ions in SrLaAlO_{4} and SrLaGaO_{4} High-T_{c} Substrates

100%
Jabłoński R., Pajączkowska A.
Acta Physica Polonica A
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1997
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vol. 92
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issue 1
173-176
EN
New results concerning paramagnetic defects in SrLaAlO_{4} and SrLaGaO_{4} high-T_{c} substrates connected with unavoidable impurity Fe^{3+} are reported. The identification was checked by measuring the spectra in SrLaAlO_{4} crystals intentionally doped with 0.5 at.% Fe. Angular dependences of three lines were distinguished at X-band frequency in the temperature range from 4 K to 300 K. We attribute these lines to the transitions inside the doublets ±1/2, and "forbidden" doublets ±3/2, ±5/2, respectively. By diagonalization of spin-Hamiltonian, parameters |D| > 1.2 cm^{-1}, |E| ≈ 0.1 cm^{-1} and g_{x}=g_{y}=g_{z}= 1.987(13) for SrLaAlO_{4} and SrLaGaO_{4} were calculated and within the margin of error they were of the same value.
3
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Electron Spin Resonance Study of Thermal Defects in SrLaAlO_{4} and SrLaGaO_{4} High-T_{c} Substrates

81%
Jabłoński R., Gloubokov A., Pajączkowska A.
Acta Physica Polonica A
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1997
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vol. 92
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issue 1
169-172
EN
The effect of annealing SrLaAlO_{4} (SLA) and SrLaGaO_{4} (SLG) crystals in oxidizing and reducing atmospheres in the temperature range of 950°C-1300°C was investigated. Three kinds of anisotropic defects D_{1}, D_{2}, and E at the temperature range of 4-300 K were found. By diagonalization of orthorhombic spin-Hamiltonian parameters: |D|=0.0541(10) cm^{-1}, |E|=0.0108(10) cm^{-1}, g_{∥}=0.883(5), and g_{⊥ }=1.922(5) for D_{1} defects for SLG and SLA were calculated and they had the same values within the margin of error.
4
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Application of Atomic Force Microscopy for Studies of Fractal and Functional Properties of Biomaterials

61%
Kulesza S., Bramowicz M., Czaja P., Jabłoński R., Kropiwnicki J., Charkiewicz M.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1013-1015
EN
The paper presents results of numerical analysis of AFM images of a surface of sandblasted Ti6Al7Nb alloys before and after wet etching procedure usually used for preparing commercially viable dental implants. Obtained results demonstrate that etching procedure efficiently cleans the implants as it leaves almost pure Ti-Al-Nb surface with trace amounts of alkali metals and increased hydrophobicity. Apart of that, it turned out that simple statistical measures of the height variations (root mean square roughness) only slightly change upon the treatment procedure, especially for scan lengths below 20 μm. On the other hand, correlation analysis exhibits bifractal surface patterns composed of regular residues left on otherwise helical ridges of the base material. Etching leaves its fingerprint in fractal dimension, but not in the corner frequency.
5
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Anisotropic Magnetic Susceptibility of Neodymium Substituted SrLaAlO_{4} Crystals

61%
Fink-Finowicki J., Puźniak R., Baran M., Jabłoński R., Berkowski M., Pajączkowska A., Szymczak H.
Acta Physica Polonica A
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1994
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vol. 85
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issue 3
633-637
EN
The uniaxial anisotropy of magnetic properties of SrLa_{1-x}Nd_{x}AlO_{4} single crystals (x = 0.01 and 0.05) was found from the measurements of temperature dependencies of magnetic susceptibility. Results of measurements, with magnetic field along a- and c-axis, are compared with the similar data obtained for CaNdAlO_{4} crystal. The successful description of experimental data was done in frames of the crystal field approximation. The anisotropy of magnetic susceptibility appears due to crystal field acting on magnetic neodymium ions in a system without exchange interactions.
6
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Superconductivity in Indium Diffused GaAs

52%
Baranowski J., Wójcik P., Palczewska M., Jabłoński R., Weber E., Yau W., Sohn H., Werner P.
Acta Physica Polonica A
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1992
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vol. 82
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issue 4
670-673
EN
Superconductivity of indium diffused GaAs was investigated. The superconductivity in these samples was identified by the magnetic susceptibility and the characteristic field modulated microwave absorption. The static magnetic susceptibility was measured from 40 K down to 2.5 K. The result shows two distinctive diamagnetic contributions within 7 K-2.5 K range. These diamagnetic contributions were correlated with the excess of In and Ga metal in GaAs.
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