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1
Content available remote Experimental Studies of Electronic Phase Separation in High Temperature Superconductors
100%
Szymczak H. , Szymczak R.
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nr 1
79-88
EN
Experimental research on macroscopic phase separation in La_{2}CuO_{4+δ} superconductor and photo-doped cuprates is reviewed. It is shown that the properties of the mixed-phase state strongly depend on the shape and size of the phase domains formed during the phase separation process. The interplay of magnetic and superconducting properties in the mixed-phase state is considered in details. The mechanisms driving the phase separation in La_{2}CuO_{4} and photo-doped materials are discussed in connection with presented experimental results.
2
Content available remote Raman Scattering Study of (Sr,Ca)_{10}Cu_{17}O_{29} Single Crystals
80%
Strzeszewski J. , Szymczak H. , Leonyuk L. , Szymczak R.
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nr 4
429-439
EN
Polarized Raman spectra of high temperature superconducting single crystals of A_{10}Cu_{17}O_{29} (A_{10}=Ca_{4.7}Sr_{4.1}Bi_{0.3}) were studied in various scattering configurations in the range of 40-700cm^{-1}. In very distinctive spectra there were found over 20 peaks. It was observed that the flat continuum of electronic excitations in the normal state was redistributed below the critical temperature. The frequency dependent redistribution is consistent with the value of energy gap estimated using tunnelling spectroscopy techniques.
3
Content available remote Anomalous Reversible Torque in Layered Superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} Single Crystal
80%
Drzazga Z. , Borgieł W. , Szymczak R. , Szymczak H.
Acta Physica Polonica A
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1996
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tom 89
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nr 1
91-98
EN
Magnetic anisotropy of layered superconducting Bi_{2}Sr_{2}CaCu_{2}O_{x} single crystal was investigated by the torque method in the reversible regime. The torque was analyzed in the model taking into account 2D layered structure. Considered model gives the better fit to the data when the magnetic field is applied near (a, b) plane. Obtained results establish to 6×10_{3} value of the superconducting effective mass anisotropy coefficient ε.
4
Content available remote Magnetocaloric Effect in La_{0.8}Sr_{0.2}MnO_{3} Film
71%
Szymczak R. , Dyakonov K. , Radelytskyi I. , Dyakonov V. , Szymczak H.
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nr 1
56-58
EN
Thin epitaxial film of La_{0.8}Sr_{0.2}MnO_{3} has been deposited on yz-cut LiNbO_{3} by pulsed laser ablation. The film was characterized by X-ray diffraction and magnetic measurements as a single phase. The magnetic properties and the magnetocaloric effect have been measured as a function of magnetic field and temperature. A reasonably high magnetocaloric effect indicates that this film might provide an efficient material for micro magnetic refrigerators.
5
Content available remote The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor
61%
Nabiałek A. , Piechota S. , Szymczak H. , Vasiliev S. , Chabanenko V. , Rusakov V.
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nr 1
235-241
EN
We investigated giant flux jumps, caused by thermomagnetic avalanches, in two cylindrical samples of conventional NbTi-50% superconductor of the same diameter -- 14 mm, but of different heights -- 4 mm and 20 mm. We studied the influence of demagnetizing effects on the flux jumps occurrence, the amount of the magnetic flux entering the sample during the following jumps and on the flux jumps dynamics. The dynamics of the magnetic flux entering the sample is compared with the dynamics of the stray field.
6
Content available remote Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
61%
Szymczak H. , Szymczak R. , Baran M. , Fink-Finowicki J. , Krzymanska B. , Aleshkevych P. , Jezierski A.
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nr 1
35-42
EN
This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like SrGa_{12-x}Cr_xO_{19} and kagome staircase Co_3V_2O_8 doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
7
Content available remote Pseudogap-Like Phenomena in Cuprates as a Manifestation of Charge-Density Waves
61%
Ekino T. , Gabovich A. , Voitenko A. , Suan Li M. , Szymczak H. , Pękała M.
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nr 1
59-66
EN
Differential conductance G as a function of the bias voltage V was measured for break-junctions of superconducting Bi_2Sr_2CaCu_2O_{8+δ} and YBa_2Cu_3O_{7-δ}. The dependences G(V) for both materials clearly demonstrate the so-called dip-hump structures outside the gap region. A theory, which suggests the charge-density-wave origin of the dip-hump structures and explains its specific form by intrinsic inhomogeneity of cuprate materials, was developed. The well-known pseudogap features in the tunnel spectra of high-T_c oxides found both below and above the superconducting critical temperature are also described by the theory, which testifies that both the pseudogap and the dip-hump structures have the same origin. Competing theories and various G(V) peculiarities found for a number of superconducting oxides are briefly discussed.
8
Content available Surface Magnetic Anisotropy of Epitaxial La_{0.7}Mn_{1.3}O_{2.84} Thin Films
51%
Aleshkevych P. , Baran M. , Dyakonov V. , Szymczak R. , Szymczak H. , Baberschke K. , Lindner J. , Lenz K.
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tom 110
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nr 1
57-70
EN
A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La_{0.7}Mn_{1.3}O_{2.84} films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å^2 was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La_{0.7}Mn_{1.3}O_{2.84} films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.
9
Content available remote Magnetic and Ferroelectric Ordering in the TbMnO_3 Film
51%
Sazanovich A. , Nikolaenko Y. , Paszkowicz W. , Mikhaylov V. , Dyakonov K. , Medvedev Y. , Nizhankovskii V. , Dyakonov V. , Szymczak H.
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nr 1
128-130
EN
Measurements of magnetization and electric polarization performed for the TbMnO_3 film grown onto the single crystal [100] SrTiO_3 substrate using magnetron sputtering technique exhibit series of anomalies related to the magnetic and electric ordering of the Tb^{3+} and Mn^{3+} sublattices. The detailed temperature dependences of the electric polarization and dielectric constant of the TbMnO_3 film have shown that the ferroelectric phase appears below 30 K in magnetic field H > 1 T applied in-plane and out-of-plane of the film.
10
Content available remote Magnet with Ferromagnetic Nearest-Neighbor and Antiferromagnetic Next-Nearest-Neighbor Exchange Interactions
51%
Szymczak R. , Szymczak H. , Kamieniarz G. , Szukowski G. , Jaśniewicz-Pacer K. , Florek W. , Maltsev V. , Babonas G.
Acta Physica Polonica A
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2009
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tom 115
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nr 5
925-930
EN
Magnetic properties of Pb[Cu(SO_4)(OH)_2] (linarite) natural single crystals were studied by magnetization and specific heat measurements. The angular dependences of magnetization were revealed which correlated with the regularities of the crystal structure. At about 2.8 K this quasi-one-dimensional Heisenberg system undergoes a phase transition to the long-range antiferromagnetic order with antiparallel magnetic moments aligned probably along the b-axis. The antiferromagnetic order is evidenced by the metamagnetic transition and pronounced λ-type anomaly at T_N in the specific heat. Using phenomenological modeling based on a quantum transfer-matrix method, we argue that at higher temperatures linarite is a quasi-one-dimensional system with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions.
11
Content available remote Magnetic Properties of the Nanocrystalline DyMnO_{3} Compound
51%
Dyakonov V. , Szytuła A. , Baran S. , Kravchenko Z. , Zubov E. , Iessenchuk O. , Bazela W. , Dul M. , Zarzycki A. , Szymczak H.
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nr 4
607-610
EN
We report on the X-ray powder diffraction and magnetic measurements of the polycrystalline and the two nanocrystalline samples of DyMnO_{3} compound synthesized at temperatures of 800 and 850°C. All samples at room temperature crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters determined change only slightly with preparation methods but the average grains size of the nanoparticles determined from X-ray data increases significantly with increasing annealing temperature. Temperature dependence of the magnetic susceptibility indicates the antiferromagnetic order in Dy sublattice at low temperatures.
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