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1
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Equation of State of Zircon-Type TbVO_{4}

100%
Minikayev R., Paszkowicz W., Werner-Malento E., Lathe C., Dąbkowska H.
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issue 2
319-322
EN
High-pressure energy-dispersive X-ray diffraction study were performed on zircon-type phase of terbium orthovanadate, TbVO_{4}, in the pressure range up to 7 GPa. For analysis of the collected diffraction spectra, Le Bail refinements were performed. The values of bulk modulus and its pressure derivative (B_0 = 121 GPa, B' = 4.1) were obtained from fitting of the second-order Birch-Murnaghan equation of state. The equation of state derived for TbVO_{4}, is compared with earlier data based on the Raman spectroscopic studies and with data of several other rare-earth orthovanadates.
2
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Magnetic Nature of a Ni Dopant in La_{1.85}Sr_{0.15}CuO_4: Spin-Glass Behavior

86%
Malinowski A., Bezusyy V., Minikayev R., Paszkowicz W., Dziawa P., Syryanyy Y., Sawicki M.
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issue 2
244-248
EN
The magnetic properties of La_{1.85}Sr_{0.15}CuO_4 doped with Ni was investigated in the field up to 5 T and in the temperature range from 2 K to 400 K using both dc and ac techniques. For Ni content larger than 0.05 the system exhibits irreversibility of low-field susceptibility χ(T) below a certain temperature depending on y and a cusp at T_{g} in χ(T) measured after zero-field cooling. The decay of remnant magnetization below T_{g} with time is described by a stretched-exponential function. In accordance with scaling theory, all the χ(T) data for y = 0.50 sample taken in the vicinity of T_{g} at different fields collapse onto two separate curves when plotted as q|t|^{-β} vs. B^2 |t|^{-β - γ}, where q is the spin-glass order parameter, t = (T - T_{g})/T_{g}, and β and γ are the critical exponents. All these features taken together reveal existence of spin-glass phase below T_{g}. Variation of T_{g} with y is linear below y = 0.25 and T_{g} extrapolates to 0 K for y → 0 what strongly suggests that spin-glass phase extends into superconducting region of the phase diagram.
3
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From Cuprate to Nickelate: Evolution of the Normal State Properties with Ni from La_{1.85}Sr_{0.15}CuO_4 to La_{1.85}Sr_{0.15}NiO_4

86%
Bezusyy V., Malinowski A., Minikayev R., Paszkowicz W., Dziawa P., Gorzelniak R.
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issue 2
402-405
EN
The influence of Ni doping on the normal-state pseudogap in La_{1.85}Sr_{0.15}CuO_4 is studied by dc magnetic susceptibility measurements, accompanied by X-ray powder diffraction analysis and resistivity measurements. The measurements are carried out on the polycrystalline La_{1.85}Sr_{0.15}Cu_{1-y}Ni_yO_4 samples in the whole doping range from y=0.01 up to y=1. The temperature of pseudogap opening is found to decrease above y=0.05 and to vanish when y exceeds 0.07. At small Ni content, up to y=0.07, the magnetic moment induced by Ni is constant and equal to 0.7 μ_{B} per Ni, while for larger y it increases abruptly and reaches about 1.6 μ_{B} per Ni ion for y = 0.5. The dependence of the normal-state resistivity on temperature evolves smoothly from the metallic-like for small y, to the variable range hopping, described by the Mott law with the exponent 1/4, for samples with y>0.15.
4
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Ultrathin Niobium in the Si/Nb/Si Trilayers

86%
Zaytseva I., Abal'oshev O., Dłużewski P., Minikayev R., Cieplak M., Zhu L., Chien C.
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vol. 126
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issue 4a
A-140-A-144
EN
We study magnetotransport properties of the Si/Nb/Si trilayers, in which the thickness of niobium, d, changes from 1.1 nm to 50 nm, while the thickness of Si is fixed at 10 nm. The niobium films are amorphous for d < 4 nm, while in thicker films the alligned polycrystalline grains are formed. We observe that the Hall coefficient changes sign into negative in the films with d < 1.6 nm. We also find that in the ultrathin films the magnetic field induces a transition from the superconducting into a metallic phase with the resistance smaller than the normal-state resistance.
5
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Evolution of Pb_{1-x}Cd_{x}Te Solid Solution Structure at High Temperatures

86%
Minikayev R., Dynowska E., Kamińska E., Szczerbakow A., Trots D., Story T., Szuszkiewicz W.
Acta Physica Polonica A
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2011
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vol. 119
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issue 5
699-701
EN
The recent successful growth of single, bulk Pb_{1-x}Cd_{x}Te crystals by self-selecting vapor transport method at the Institute of Physics of the Polish Academy of Sciences in Warsaw opened new opportunities to study the physical properties of this interesting material in detail. In this work we report the preliminary results of X-ray powder diffraction studies performed on a set of Pb_{1-x}Cd_{x}Te solid solutions (where x ≤ 0.056) at high temperatures (295 K ≤ T ≤ 1100 K) and analyzed with the Rietveld refinement. Our results demonstrate the necessity of some correction of the relevant phase diagram and of the solubility limit, known from the literature.
6
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Superconductivity and Magnetism in Nd_{0.5}Sr_{0.5}MnO_3/YBa_2Cu_3O_7 Superlattices

86%
Tsarou A., Paszkowicz W., Minikayev R., Dłużewski P., Sawicki M., Przysłupski P.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
179-183
EN
We report the synthesis and characterization of Nd_{0.5}Sr_{0.5}MnO_3/YBa_2Cu_3O_7 superlattices. X-ray diffraction studies show that the superlattices are [001] oriented. We observe that the magnetic ground state of Nd_{0.5}Sr_{0.5}MnO_3 system in a multilayered structure is strongly dependent on the substrate.
7
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Microhardness and the Young Modulus of Thin, MBE-Grown, (Sn,Mn)Te Layers Containing up to 8% of Mn

86%
Adamiak S., Zięba M., Minikayev R., Reszka A., Taliashvili B., Szuszkiewicz W.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
347-350
EN
The thin layers of (Sn,Mn)Te solid solution were grown by molecular beam epitaxy onto (111)-oriented BaF₂ substrates and characterized by scanning electron microscopy, atomic force microscopy, energy dispersive X-ray spectrometry, and X-ray diffraction methods. The epitaxial character of the growth was confirmed. All the layers exhibited a regular (fcc) structure of the rock-salt type and were (111)-oriented, their thickness was close to about 1 μm. The layers contained up to 8% of Mn. The microhardness and the Young modulus values were determined by the nanoindentation measurements. The Berkovich type of the intender was applied, the maximum applied load was equal to 1 mN. The results of measurements demonstrated a lack of the composition dependence of the Young modulus value. A slight increase of the microhardness value with an increasing Mn content in the (Sn,Mn)Te solid solution was observed.
8
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Structure and Electrical Resistivity Dependence of Molybdenum Thin Films Deposited by DC Modulated Pulsed Magnetron Sputtering

73%
Wicher B., Chodun R., Nowakowska-Langier K., Okrasa S., Król K., Minikayev R., Strzelecki G., Zdunek K.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 3
9
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The Young Modulus and Microhardness Anisotropy in (Pb,Cd)Te Solid Solution Crystallizing in the Rock Salt Structure and Containing 5% of Cd

73%
Łusakowska E., Adamiak S., Adamski P., Kuna R., Minikayev R., Skupiński P., Szczerbakow A., Szuszkiewicz W.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
343-346
EN
A single crystal of (Pb,Cd)Te solid solution with Cd content equal to 5% was grown by self-selecting vapour growth technique and characterized by powder X-ray diffraction using the X'Pert PANalytical diffractometer and Cu K_{α₁} radiation. The X-ray diffraction pattern refinement demonstrated the fcc structure of the rock-salt type of investigated sample, no precipitates or other crystal phases were detected. The sample chemical composition was determined on the basis of measured lattice parameter value. Next, the Young modulus and microhardness were determined by the nanoindentation for carefully prepared, (001), (011) and (111)-oriented single crystal plates. The slight anisotropy of two parameters mentioned above has been found and compared with available literature data.
10
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Structure and Magnetic Characterization οf BiFeO_3/YBa_2Cu_3O_7 Bilayers

73%
Werner-Malento K., Tsarou A., Dluzewski P., Paszkowicz W., Minikayev R., Sawicki M., van der Beek K., Konczykowski M., Przyslupski P.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
95-97
EN
Bilayered epitaxial BiFeO_3/YBa_2Cu_3O_7 films were fabricated on (100) [(LaAlO_3)_{0.3}(Sr_2TaAlO_6)_{0.7}] substrates by sputtering method. For structural comparison the bilayered BiFeO_3/La_{0.67}Sr_{0.33}MnO_3 films were also deposited on (100) SrTiO_3 substrates. A weak ferromagnetic moment is observed in BiFeO_3/YBa_2Cu_3O_7 films. The mechanism responsible for weak ferromagnetic moment arises presumably from the epitaxy strain induced canted antiferromagnetic structure.
11
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Inelastic X-Ray Scattering Studies of Phonon Dispersion in PbTe and (Pb,Cd)Te Solid Solution

73%
Kuna R., Minikayev R., Trzyna M., Gas K., Bosak A., Szczerbakow A., Petit S., Łażewski J., Szuszkiewicz W.
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EN
PbTe and its solid solution (Pb,Cd)Te containing 2% of CdTe and PbTe grown by self-selecting vapour growth technique were investigated by inelastic X-ray scattering using synchrotron radiation. The ID28 beamline at ESRF with the incident photon energy of 17794 eV and the energy resolution of 3 meV was applied for that purpose. The measurements were performed at room temperature along [001]-type high symmetry direction in the Brillouin zone. In spite of a very low energy of phonon branches they can be determined by inelastic X-ray scattering with a high accuracy. The transversal acoustic phonon dispersion obtained by inelastic X-ray scattering corresponds well to those resulting from inelastic neutron scattering measurements and ab initio calculations. Apart from expected structures corresponding to the bulk phonons an additional scattering related to the crystal surface properties was observed in the inelastic X-ray scattering spectra. The analysis performed with the use of secondary ion mass spectroscopy technique demonstrated a presence of a thin oxide layer at sample surfaces.
12
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Hardening of (Pb,Cd)Te Crystal Lattice with an Increasing CdTe Content in the Solid Solution

73%
Kuna R., Adamiak S., Petit S., Baroni P., Gas K., Minikayev R., Szczerbakow A., Łażewski J., Szuszkiewicz W.
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EN
Single crystals of the (Pb,Cd)Te solid solution with CdTe content up to 9% were grown by self-selecting vapour growth method and investigated by powder X-ray diffraction, inelastic neutron scattering, and nanoindentation measurements. The analysis of the linear part of the LA phonon dispersion, determined by the inelastic neutron scattering demonstrated an increase of the sound velocity (thus the hardening of the crystal lattice) with an increase of CdTe content in the solid solution. An important increase of microhardness value for (Pb,Cd)Te was directly confirmed by results of nanoindentation measurements performed for a few samples with various chemical composition.
13
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ZnCoO Films Obtained at Low Temperature by Atomic Layer Deposition Using Organic Zinc and Cobalt Precursors

59%
Łukasiewicz M., Wójcik-Głodowska A., Guziewicz E., Jakieła R., Krajewski T., Łusakowska E., Paszkowicz W., Minikayev R., Kiecana M., Sawicki M., Godlewski M., Wachnicki Ł., Szczepanik A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1235-1240
EN
In this paper we report on ZnCoO thin films grown by atomic layer deposition method in reactor F-120 Satellite. ZnCoO films were grown at low temperature (T_s=160°C) with a new zinc precursor (dimethylzinc - DMZn) and with cobalt (II) acetyloacetonate (Co(acac)₂) as a cobalt precursor and deionized water as an oxygen precursor. In this paper we concentrate on the methods of homogenizing Co distribution in ZnCoO films.
14
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Magnetic and Structural Studies of GeMnSnTe Epitaxial Layers

59%
Grochot A., Knoff W., Taliashvili B., Wołkanowicz W., Minikayev R., Pieniążek A., Łusakowska E., Sawicki M., Jantsch W., Story T., Przybylińska H.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
340-342
EN
MBE grown Ge_{1-x-y}Mn_xSn_yTe layers with Mn content ranging from 10 to 30% and Sn content ranging from 2 to 5% have been characterized with X-ray diffraction, energy-dispersive X-Ray spectroscopy, atomic force microscopy, SQUID magnetometry, and ferromagnetic resonance. All layers (except the one with the highest Mn and Sn content) were found to be single phase rhombohedral, with the distortion axis perpendicular to the layer surface, and ferromagnetic. Ferromagnetic resonance studies have shown that co-doping with a few percent of tin makes the lattice more rigid and changes considerably the magnetocrystalline anisotropy, from purely uniaxial in GeMnTe to distorted cubic in Ge_{1-x-y}Mn_xSn_yTe at the same Mn content.
15
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Magnetic, Structural, and Optical Properties of Low Temperature ZnMnO Grown by Atomic Layer Epitaxy

59%
Wójcik A., Kiecana M., Kopalko K., Godlewski M., Guziewicz E., Yatsunenko S., Łusakowska E., Minikayev R., Paszkowicz W., Świątek K., Wilamowski Z., Sawicki M., Dietl T.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
915-921
EN
Magnetic, structural, and optical properties of ZnMnO films grown with atomic layer epitaxy are discussed. Atomic layer epitaxy films were grown at low temperature using organic zinc and manganese precursors. From magnetometry and electron spin resonance investigations we conclude that lowering of a growth temperature significantly limits formation of Mn precipitates and inclusions of different foreign phases of manganese oxides to ZnMnO host.
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