A5020508708- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Magneto-Optical Properties and Applications
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Solid-state spectroscopy and crystallography
- Microstructure and Mechanical Properties of Steels
- Advanced Fiber Laser Technologies
- Rare-earth and actinide compounds
- Chalcogenide Semiconductor Thin Films
- Central European Literary Studies
- Surface Roughness and Optical Measurements
- Advanced Thermoelectric Materials and Devices
- Superconducting Materials and Applications
- Optical Polarization and Ellipsometry
- Geophysics and Sensor Technology
- Polish Historical and Cultural Studies
- Electromagnetic Effects on Materials
- Structural Engineering and Materials Analysis
- High-pressure geophysics and materials
- Photonic Crystal and Fiber Optics
- Phase-change materials and chalcogenides
Polish Academy of Sciences
2001-2020
Institute of Physics
2000-2017
Czech Academy of Sciences, Institute of Physics
1989-1993
Magnetization of polycrystalline La1−xSrxMnO3 samples with x=0.13 and x=0.16 has been measured as a function temperature external magnetic field. Using the gathered data thermodynamic Maxwell’s relation, changes contribution to entropy under influence field, allowing estimate value magnetocaloric effect, have determined. The reach ∼7 J/(kg K) in field 7 T, which makes studied good candidates for application refrigeration. Expressions describing its change derived molecular approximation....
Magnetization studies have been carried out on a single crystal of TbBaCo2O5.5 in the temperature range 2–350 K and magnetic fields up to 50 kOe. Several spontaneous phase transitions observed analysed both Co (TC = 277 K, TN1 210 K) Tb (TN2 3.44 subsystems. It is shown that first-order transition at from an antiferromagnetic weak ferromagnetic state accompanied by intermediate state. The properties this are strongly determined thermo-magnetic history sample. Metamagnetic type 140 K< T<190...
Magnetic and transport thermal measurements of nanosize (La0.7Sr0.3)0.9Mn1.1O3 manganite are reported. The nanoparticles synthesized with use the co-precipitation method at different (800, 900, 950°C) temperatures. Their crystal structure is determined to be perovskite-like a rhombohedral distortion (the space group R3¯c). phase composition specific surface nanopowders determined. average size (from 40to100nm) estimated by both low-temperature adsorption argon x-ray diffraction measurements....
Magnetocaloric effect and specific heat of a La0.845Sr0.155MnO3 sample were measured over temperature range 4.2–300 K, to verify whether large entropy changes induced by magnetic field make possible the use manganites for refrigeration magnetostrictive contribution magnetocaloric is significant. Isothermal change adiabatic ΔB=7 T determined as functions temperature. Near Curie temperature, TC≈234 they reach, respectively, ∼−6.6 J/(kg K) ∼3.4 i.e., values ∼2 ∼4 times smaller than Gd. Despite...
Recently, geometry‐induced quantum effects in periodic nanostructures were introduced and observed. Nanograting has been shown to dramatically improve thermoelectric electron emission properties, originate a geometry induced doping or G‐doping. Here, we concentrate on experimental investigation of We fabricate nanograting (NG) layers measure their transport properties. The grating was fabricated the surface silicon insulator (SOI) wafer device layer using laser interference lithography...
Due to their broadband nonlinear optical properties, low-dimensional materials are widely used for pulse generation in fiber and solid-state lasers. Here we demonstrate novel materials, Bi2Te2Se (BTS) Sn-doped (BSTS), which can be as a universal saturable absorbers distinct spectral regimes. The material was mechanically exfoliated from bulk single-crystal deposited onto side-polished fiber. We have performed characterization of the fabricated devices employed them polarization-maintaining...
The lattice deformation effect on structure and spin ordering of Mn ions, created by varying the average radius $A$ site cations $(⟨{r}_{A}⟩)$ as a result ${\text{Nd}}^{3+}$ substitution for ${\text{La}}^{3+}$, has been studied in ${\text{La}}_{1\ensuremath{-}x}{\text{A}}_{x}{\text{MnO}}_{3+\ensuremath{\delta}}$ manganite series $(0\ensuremath{\le}x\ensuremath{\le}1.0)$. crystalline is shown to evolve across three crystallographic regions with decreasing $⟨{r}_{A}⟩$. compound $x=0.0$...
Spin reorientation Γ4 (Fz, Gx) → Γ2 (Fx, Gz) induced by a magnetic field parallel to the α-axis has been studied in disprosium orthoferrite at temperatures above Morin point. A new first-order phase transition from Γ24 Fz, Gx, state Γ12 Gy, one found. phenomenological model describing spin DyFeO3 is proposed.
A new method of Bitter pattern formation in the temperature range from 5K to 35K has been developed. The domain walls have made visible by fined solid oxygen particles produced process gaseous cooling a helium atmosphere. presented is particularly useful for low investigations bulk materials. Photographs patterns obtained at 6K YFeO3 orthoferrite plate and BaFe12O19 crystal are shown.
The main objective of the performed investigations was to enhance sensitivity a current sensor weak changes magnetic field. New design based on magnetoresistance effect – MRE (MRE = (RH - R0)/R0 , where RH is resistance in field and R0 without field) developed. produced form an annular magnet with gap, which (La0.7Sr0.3)0.8Мn1.2О3 manganite film possessing large negative inserted. Nominal controllable electric circuit can change from few tenths parts ampere hundred amperes. limit detectable...
High-quality $p$-type PbTe-CdTe monocrystalline alloys containing up to 10 at.$%$ of Cd have been obtained by self-selecting vapor transport method. Mid-infrared photoluminescence experiments performed in order follow the variation fundamental energy gap as a function content. The Hall mobility, thermoelectric power, thermal conductivity, and figure-of-merit parameter $ZT$ were investigated experimentally theoretically with special attention paid two-valence band structure material. It is...
Measurements of heat capacity and conductivity InSe single crystal have been carried out over the temperature range 5–300 K. Heat Cp, entropy ΔS, enthalpy ΔH as well Debye temperatures calculated. The singularities observed on dependencies electric can be attributed to a phase transition charge density wave state. This perturbs considerably electron phonon spectra studied layered crystal.
For the first time, thin films of NdBaCo2O5+x were deposited by RF magnetron sputtering on different substrates.The SrLaAlO4(001) substrates exhibited highly textured structure with c-axis directed out-of-plane.Magnetic measurements M vs. T three NdBaCo2O5+x/SrLaAlO4(001) revealed successively paramagnetic-ferromagnetic-antiferromagnetic transitions decrease in temperature.Their paramagnetic Curie-Weiss temperatures estimated to be range TC = 100-116 K. Resistivity cobaltite film insulating...