A5045601032- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Luminescence Properties of Advanced Materials
- Quantum and electron transport phenomena
- Crystallization and Solubility Studies
- Physics of Superconductivity and Magnetism
- Perovskite Materials and Applications
- Rare-earth and actinide compounds
- Graphene research and applications
- Iron-based superconductors research
- Magnetic Properties of Alloys
- Thermal Expansion and Ionic Conductivity
- Nuclear materials and radiation effects
- Inorganic Chemistry and Materials
- Magnetic Properties and Applications
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Surface and Thin Film Phenomena
- X-ray Diffraction in Crystallography
- 2D Materials and Applications
- Catalysis and Oxidation Reactions
- High-pressure geophysics and materials
Polish Academy of Sciences
2012-2024
Institute of Physics
2010-2022
Polish Academy of Learning
2012-2018
The exchange-bias (EB) effect with sign reversal was found in $\mathrm{LuF}{\mathrm{e}}_{0.5}\mathrm{C}{\mathrm{r}}_{0.5}{\mathrm{O}}_{3}$ ferrite-chromite, which is a weak ferrimagnet below ${T}_{\mathrm{N}}=265\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, exhibiting antiparallel orientation of the ferromagnetic (FM) moments Fe and Cr sublattices due to opposite Fe-Cr Dzyaloshinskii vector, as compared that Fe-Fe Cr-Cr. FM studied compound compensate each other at temperature...
We have performed electron transport and angle-resolved photo-emission spectroscopy (ARPES) measurements on single crystals of transition metal dipnictide TaAs2cleaved along the (2¯01) surface which has lowest cleavage energy. A Fourier transform Shubnikov-de Haas oscillations shows four different peaks whose angular dependence was studied with respect to angle between magnetic field [2¯01] direction. The results indicate elliptical shape Fermi cross-sections. Additionally, a mobility...
The compensated ferrimagnet orthoferrite $\mathrm{ErFe}{\mathrm{O}}_{3}$ exhibits the exchange bias (EB) effect, which was previously detected as traditional shift of magnetization hysteresis loops $M$ vs $H$ near compensation temperature ${T}_{\mathrm{comp}}=45\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. This paper shows that another specific phenomenon, temperature-driven spin switching and bias, occurs in this ferrimagnet. Namely, EB manifests itself $T$, upon successive cooling heating a...
This comprehensive work showcases two novel, rock-salt-type minerals in the form of amphoteric cerium-tungstate double perovskite and ilmenite powders created via a high-temperature solid-state reaction inert gases. The presented studies have fundamental meaning will mainly focus on detailed synthesis description undoped structures, researching their possible polymorphism various conditions hinting at some nontrivial physicochemical properties like charge transfer for upcoming optical after...
Magnetic and structural properties of nanocrystalline low-doped La0.8Ca0.2CoO3 cobaltites with particle size 8, 13, 23, 50 nm, prepared by the glycine-nitrate method, were investigated in temperature range 5–320 K, magnetic field up to kOe under hydrostatic pressure 10 kbar. With downsizing, a noticeable expansion unit cell, concomitant changes rhombohedral structure toward cubic one was observed. It found that increased surface-disorder effect strongly suppresses ferromagnetic state...
An exchange bias (EB) effect was observed in mixed valent $\mathrm{L}{\mathrm{a}}_{x}\mathrm{B}{\mathrm{a}}_{1\ensuremath{-}x}\mathrm{Fe}{\mathrm{O}}_{3}$ ($x=0.125$, 0.25, 0.33) perovskites exhibiting the antiferromagnetic (AFM) helical order among $\mathrm{F}{\mathrm{e}}^{4+}$ ions coexisting with ferromagnetic (FM) cluster phase ground state. The $\mathrm{L}{\mathrm{a}}^{3+}$ for $\mathrm{B}{\mathrm{a}}^{2+}$ site substitution, associated increase number of AFM coupled...
The exchange bias (EB) effect and an appearance of the Griffiths phase (GP) were found in half-doped cobaltite $\mathrm{G}{\mathrm{d}}_{0.5}\mathrm{S}{\mathrm{r}}_{0.5}\mathrm{Co}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ exhibiting a significant quenched disorder due to ion size mismatch between Sr Gd. weakens ferromagnetic (FM) interactions Co ions, leading low Curie temperature ${T}_{C}=90\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ highly nonhomogenous magnetic state above ${T}_{C}$....
The possibility of inducing superconductivity in type-I Weyl semimetal through coupling its surface to a superconductor was investigated. A single crystal NbP, grown by chemical vapor transport method, carefully characterized XRD, EDX, SEM, ARPES techniques and electron measurements. mobility spectrum the carriers determined. For studies interface transmission, (001) covered several hundred nm thick metallic layers either Pb, or Nb, In. DC current-voltage characteristics AC differential...
Topological nodal-line semimetals represent a unique class of materials with intriguing electronic structures and rich symmetries, hosting states nontrivial topological properties. Among these, $\mathrm{ZrA}{\mathrm{s}}_{2}$ stands out, characterized by its nodal lines in momentum space, governed nonsymmorphic symmetries. This study integrates angle-resolved photoemission spectroscopy (ARPES) density functional theory (DFT) calculations to explore the $\mathrm{ZrA}{\mathrm{s}}_{2}$. Our...
Magnetic properties of compacted Sm0.1Ca0.9MnO3 nanoparticles with average particle size 25 and 60 nm have been investigated. It was found that the relative volume ferromagnetic phase decreases decreasing size. Magnetization curves measured in field cooled zero mode separate near transition temperature TC remain different even magnetic 15 kOe. AC-susceptibility is strongly frequency dependent below TC, although maximum depends on only slightly. hysteresis loops exhibit horizontal vertical...
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...
Magnetic properties of compacted Sm0.8Ca0.2MnO3 (SCMO) particles with average particle size 23–100 nm, prepared by the glycine-nitrate method, have been investigated. It was found that relative volume ferromagnetic phase decreases decreasing size. Curves field-cooled and zero-field-cooled magnetization (MZFC) exhibit a bifurcation just below Curie temperature, TCdc ≈ 55–64 K, determined from measurements for all studied. The field dependence MZFC peak shows reasonable agreement both de...
The effect of hydrostatic pressure on magnetic entropy change in a field, ΔSm, Fe7Se8 single crystals is determined. application shifts the spin–reorientation transition temperature, TSRT, to lower temperatures, similar action field applied perpendicularly c-axis. magnetization parallel c-axis monotonically decreases under increasing pressure. ΔSm and refrigeration capacity investigated strongly depend TSRT thus Experimental results are described frame one-ion model anisotropy.
Abstract Growth conditions and electron paramagnetic resonance investigations of two well oriented KSm(WO4)2 KEr(WO4)2 single crystals have been presented discussed. Hyperfine structure Sm3+ ion was detected analyzed for angular temperature dependences. EPR spectra its dependence showed the presence 5 magnetically nonequivalent Er centers in crystal. A change type magnetic interactions using mixed (Gaussian Lorentzian) fits spectra.
The electrical and thermo-electrical transport effects of the TaAs$_2$ semimetal were measured in a magnetic field applied along [-2 0 1] direction. resulting dependences resistivity as well Hall, Seebeck Nernst coefficient below T ~ 100 K can be satisfactory described within two-band model consisting electron hole pockets. At low temperature all exhibit significant contribution from quantum oscillations. fast Fourier transform (FFT) oscillatory signal shows two fundamental frequencies, Fa =...
The influence of Co and Ni ion doping on the crystal structure, phase transitions, magnetic properties Fe7Se8 system has been investigated. compounds studied are (Fe0.987Ni0.013)7Se8, (Fe0.955Ni0.045)7Se8, (Fe0.915Ni0.085)7Se8, (Fe0.89Ni0.11)7Se8, (Fe0.79Ni0.21)7Se8, (Fe0.975Co0.025)7Se8, (Fe0.951Co0.049)7Se8, (Fe0.91Co0.09)7Se8 as well parent compound Fe7Se8. crystals grown using a modified Bridgman method exist hexagonal NiAs-like structure with an ordered distribution Fe vacancies that...
Structural and magnetic properties of La0.2Ca0.8MnO3 nanoparticles with average size 15-37 nm, prepared by the glycine-nitrate method, have been studied. Synchrotron experiments performed in temperature range 80-300 K shown that a structural transition from room orthorhombic Pnma to monoclinic P2(1)/m space group, associated orbital ordering, occurs below 200 studied particles. This observed for largest particles 37 nm is very close bulk, as seen similar variation lattice parameters strain....
The potassium holmium double tungstate was prepared by using top seeded solution growth technique.Structural investigations have been performed at room temperature.The KHo(WO4)2 single crystal belongs to the monoclinic space group C2/c with unit-cell parameters: a = 10.624(2)Å, b 10.352(2)Å, c 7.5434(15) Å, β 130.78(3) o , and Z 4.The atomic coordinates, isotropic anisotropic displacement parameters interionic distances for studied structure were determined.
Topological nodal-line semimetals represent a unique class of materials with intriguing electronic structures and rich symmetries, hosting states nontrivial topological properties. Among these, ZrAs$_2$ stands out, characterized by its nodal lines in momentum space, governed nonsymmorphic symmetries. This study integrates angle-resolved photoemission spectroscopy (ARPES) density functional theory (DFT) calculations to explore the ZrAs$_2$. Our provides experimental evidence...
Abstract Growth conditions and crystal morphology of erbium KEr(WO 4 ) 2 (KEW) samarium KSm(WO (KSW) potassium double tungstates have been investigated. Monoclinic single crystals grown by TSSG method using K W O 7 solvent. It was found that the vertical temperature gradient in a range 0.3 – 0.5 K/mm is optimal for growth. The their quality strongly depend on seed orientation. best results are achieved when growth takes place seeds oriented along [010] direction. For KEW, possible lowering...
Studies of the Fermi surface modification after $\mathit{in}\phantom{\rule{0.16em}{0ex}}\mathit{situ}$ covering NbP semimetal with heavy elements Pb and Nb ultrathin layers were performed by means angle-resolved photoemission spectroscopy (ARPES). First, electronic structure was investigated for pristine single crystals two possible terminations (P Nb) (0 0 1) surface. The nature states these cleaving planes is different: P-terminated shows spoon bow tie-shaped states, whereas shapes are not...