A5025822149- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- Ferroelectric and Piezoelectric Materials
- Inorganic Chemistry and Materials
- Solid-state spectroscopy and crystallography
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetic Properties and Synthesis of Ferrites
- Magnetism in coordination complexes
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Advanced Thermoelectric Materials and Devices
- Nuclear Materials and Properties
- Magneto-Optical Properties and Applications
- Acoustic Wave Resonator Technologies
- Topological Materials and Phenomena
- 2D Materials and Applications
- Lanthanide and Transition Metal Complexes
- Magnetic Properties and Applications
- Mineralogy and Gemology Studies
Charles University
2016-2025
Czech Academy of Sciences, Institute of Physics
2015-2023
Česká Zbrojovka (Czechia)
2014-2015
Institut Laue-Langevin
2008-2011
The hydrolysis of Ln(ClO4)3 in the presence acetate leads to assembly three largest known lanthanide-exclusive cluster complexes, [Nd104(ClO4)6(CH3COO)60(μ3-OH)168(μ4-O)30(H2O)112]·(ClO4)18·(CH3CH2OH)8·xH2O (1, x ≈ 158) and [Ln104(ClO4)6(CH3COO)56(μ3-OH)168(μ4-O)30(H2O)112]·(ClO4)22·(CH3CH2OH)2·xH2O (2, Ln = Nd; 3, Gd; 140). structure common 104-lanthanide core, abbreviated as Ln8@Ln48@Ln24@Ln24, features a four-shell arrangement metal atoms contained an innermost cube (a Platonic solid)...
The magnetocaloric effect of orthorhombic Gd(OH)CO<sub>3</sub>has been experimentally studied, which exhibits −Δ<italic>S</italic><sub>m</sub>up to 66.4 J kg<sup>−1</sup>K<sup>−1</sup>(355 mJ cm<sup>−3</sup>K<sup>−1</sup>) for Δ<italic>H</italic>= 7 T and<italic>T</italic>= 1.8 K.
The heavy fermion paramagnet UTe
$\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ ceramics were investigated by means of infrared reflectivity and time domain terahertz transmission spectroscopy at temperatures $20--950\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the magnetodielectric effect was studied $10--300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with magnetic field up to $9\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Below $175\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, sum polar phonon contributions permittivity corresponds value measured...
The comprehensive study reported herein provides compelling evidence that anion templates are the main driving force in formation of two novel nanoscale lanthanide hydroxide clusters, {Gd38(ClO4)6} (1) and {Gd48Cl2(NO3)} (2), characterized by single-crystal X-ray crystallography, infrared spectroscopy, magnetic measurements. {Gd38(ClO4)6}, encapsulating six ClO4(-) ions, features a cage core composed twelve vertex-sharing {Gd4} tetrahedrons one Gd⋅⋅⋅Gd pillar. When Cl(-) NO3(-) were...
The magnetocaloric effect of an inorganic framework material with repeating GdF<sub>3</sub> units has been studied using isothermal magnetization and heat capacity measurements.
The unconventional superconductor UTe <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mrow/> <mml:mn>2</mml:mn> </mml:msub> </mml:math> exhibits numerous signatures of spin-triplet superconductivity—a rare state matter which could enable quantum computation protected against decoherence. possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, metamagnetic transition to field-polarized...
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mtext>UTe</a:mtext><a:mn>2</a:mn></a:msub></a:math> is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurements to probe its Fermi surface and effective carrier masses. It has been reported that <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Abstract Two kinds of inorganic gadolinium(III)‐hydroxy “ladders”, [2× n ] and [3× ], were successfully trapped in succinate (suc) coordination polymers, [Gd 2 (OH) (H O)] ⋅ H O ( 1 ) 6 8 5 O) 4 ), respectively. Such polymers could be regarded as alternating inorganic–organic hybrid materials with relatively high density. Magnetic heat capacity studies reveal a large cryogenic magnetocaloric effect (MCE) both compounds, namely (Δ =70 kG) 42.8 J kg −1 K for complex 48.0 . The the density is...
Water is characterized by large molecular electric dipole moments and strong interactions between molecules; however, hydrogen bonds screen the dipole-dipole coupling suppress ferroelectric order. The situation changes drastically when water confined: in this case ordering of dipoles has been predicted, but never unambiguously detected experimentally. In present study we place separate H2O molecules structural channels a beryl single crystal so that they are located far enough to prevent...
Abstract The transformation of Mn II glycolates (glc) between the three‐dimensional coordination polymer [Mn(glc) 2 ] n ( 1 ) and discrete mononuclear phase (H O) can be reversibly switched by water molecules, which dramatically change magnetocaloric effect (MCE) from maximum 6.9 J kg −1 K in to 60.3 . This case example reveals that magnetic coupling on MCE plays a dominant role over other factors such as density for 3d‐type refrigerants.
Abstract Intermolecular hydrogen bonds impede long-range (anti-)ferroelectric order of water. We confine H 2 O molecules in nanosized cages formed by ions a dielectric crystal. Arranging them channels at distance ~5 Å with an interchannel separation ~10 prevents the formation networks while electric dipole-dipole interactions remain effective. Here, we present measurements temperature-dependent permittivity, pyrocurrent, polarization and specific heat that indicate order-disorder...
Electronic properties of ${\mathrm{Dy}}_{3}{\mathrm{Ru}}_{4}{\mathrm{Al}}_{12}$ (hexagonal crystal structure, Dy atoms form distorted kagome nets) are studied on a single by means magnetization, neutron diffraction, specific heat, and resistivity measurements. The onset long-range magnetic order moments occurs at 7 K through first-order phase transition. compound has noncollinear antiferromagnetic structure with propagation vector (1/2 0 1/2). configuration the is consistent monoclinic...
The properties of the novel heavy fermion superconductor Ce$_3$PtIn$_{11}$ are investigated by thermodynamic and transport measurements at ambient under hydrostatic pressure. At pressure compound exhibits two successive magnetic transitions $T_1$ $\approx$ 2.2 K $T_{\rm N}$ 2 into antiferromagnetically ordered states enters a superconducting phase below c}$ 0.32 K. coexistence long-range order superconductivity is discussed in context existence crystallographically inequivalent Ce-sites unit...
Many current research efforts in strongly correlated systems focus on the interplay between magnetism and superconductivity. Here we report coexistence of both cooperative ordered states recently discovered stoichiometric fully inversion symmetric heavy fermion compound Ce3PdIn11 at ambient pressure. Thermodynamic transport measurements reveal two successive magnetic transitions T1 = 1.67 K TN 1.53 into antiferromagnetic type states. Below Tc 0.42 enters a superconducting state. The large...
We studied experimentally the high-temperature magnetoelectric ${({\mathrm{Ba}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x})}_{3}{\mathrm{Co}}_{2}{\mathrm{Fe}}_{24}{\mathrm{O}}_{41}$ prepared as ceramics ($x=0$, 0.2) and a single crystal ($x=0.5$) using inelastic neutron scattering, THz time-domain, Raman, far-infrared spectroscopies. The spectra, measured with varying temperature magnetic field, reveal rich information about collective spin lattice excitations. In ceramics, we observed an...
Pb2MnTeO6, a new double perovskite, was synthesized. Its crystal structure determined by synchrotron X-ray and powder neutron diffraction. Pb2MnTeO6 is monoclinic (I2/m) at room temperature with regular arrangement of all the cations in their polyhedra. However, when lowered to ∼120 K it undergoes phase transition from I2/m C2/c structure. This accompanied displacement Pb atoms center polyhedra due 6s2 lone-pair electrons, together surprising off-centering Mn2+ (d5) magnetic cations. strong...
A comprehensive study of magnetocrystalline anisotropy a layered van der Waals ferromagnet $\mathrm{V}{\mathrm{I}}_{3}$ was performed. We measured angular dependences the torque and magnetization with respect to direction applied magnetic field within basal $ab$ plane general orthogonal $ab$, respectively. twofold butterflylike signal detected by in plane. This symmetry remains conserved throughout all regimes as well through known structural transition down lowest temperatures. The maximum...
Spin and lattice dynamics of ${\mathrm{CaMn}}_{7}{\mathrm{O}}_{12}$ ceramics were investigated using infrared, THz, inelastic neutron scattering (INS) spectroscopies in the temperature range 2 to 590 K, and, at low temperatures, applied magnetic fields up 12 T. On cooling, we observed phonon splitting accompanying structural phase transition ${T}_{\mathrm{C}}=450$ K as well onset incommensurately modulated structure 250 K. In two antiferromagnetic phases below ${T}_{\mathrm{N}1}=90$...
Recently, the low-temperature phase of water molecules confined within nanocages formed by crystalline lattice water-containing cordierite crystals has been reported to comprise domains with ferroelectrically ordered dipoles a, b-planes which are antiferroelectrically alternating along c-axis. In present work, comprehensive broad-band dielectric spectroscopy is combined specific heat studies and molecular dynamics Monte Carlo simulations in order investigate more detail collective modes...