A5074054554- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Iron-based superconductors research
- Crystallization and Solubility Studies
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Magnetic Properties and Applications
- X-ray Diffraction in Crystallography
- Hydrogen Storage and Materials
- Microstructure and Mechanical Properties of Steels
- Thermodynamic and Structural Properties of Metals and Alloys
- Crystal Structures and Properties
- Magneto-Optical Properties and Applications
- Boron and Carbon Nanomaterials Research
- Physics of Superconductivity and Magnetism
- Metallic Glasses and Amorphous Alloys
- Calcium Carbonate Crystallization and Inhibition
- Chemical and Physical Properties of Materials
- Shape Memory Alloy Transformations
- Neuroscience and Neural Engineering
- Lubricants and Their Additives
- Quantum and electron transport phenomena
TU Dresden
2015-2025
Lomonosov Moscow State University
2010-2022
Heinz Maier-Leibnitz Zentrum
2017
Technical University of Munich
2017
Moscow State University
2015
In geometrically frustrated magnetic systems, weak interactions or slight changes to the structure can tip delicate balance of exchange interactions, sending system into a different ground state. Brochantite, Cu$_4$SO$_4$(OH)$_6$, has copper sublattice composed distorted triangles, making it likely host for magnetism, but exhibits stacking disorder. The lack synthetic single crystals limited research on magnetism in brochantite powders and natural mineral crystals. We grew which we find be...
Frustrated magnetism in face-centred cubic (fcc) magnetic sublattices remains underexplored but holds considerable potential for exotic behaviour. Here we report on the crystal structure, and thermodynamic properties of $A$-site-vacant double hydroxide perovskite MnSn(OH)$_6$. Despite dominant antiferromagnetic interactions among Mn$^{2+}$ moments, evidenced by a negative Curie-Weiss temperature, lack sharp transition down to 350$\,$mK implies absence long-range order. However, broad hump...
Centrosymmetric compounds which host three-dimensional topological spin structures comprise a distinct subclass of materials in multiple-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi mathvariant="bold">q</a:mi></a:mrow></a:math> magnetic order is stabilized by anisotropy and bond frustration contrast to the more common path antisymmetric exchange interactions. Here we investigate static dynamic properties cubic perovskite <d:math...
Spinon-magnon mixing was recently reported in botallackite ${\mathrm{Cu}}_{2}{(\mathrm{OH})}_{3}\mathrm{Br}$ with a uniaxially compressed triangular lattice of ${\mathrm{Cu}}^{2+}$ quantum spins [H. Zhang et al., Phys. Rev. Lett. 125, 037204 (2020)]. Its nitrate counterpart rouaite, ${\mathrm{Cu}}_{2}{(\mathrm{OH})}_{3}{\mathrm{NO}}_{3}$, has highly analogous structure and might be expected to exhibit similar physics. To lay foundation for research on this material, we clarify rouaite's...
We report on measurements of the sound velocity and attenuation in a single crystal candidate quantum-spin-ice material ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ as function temperature magnetic field. The acoustic modes couple to spins magnetoelastically and, hence, carry information about spin correlations that sheds light intricate phase diagram nature dynamics material. Particularly, we find pronounced thermal hysteresis data with concomitant peak specific heat indicating...
The cubic perovskite ${\text{SrFeO}}_{\text{3}}$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked explain such magnetic order. Hints of complex phase diagram have also been found powder samples single-layer Ruddlesden-Popper analog ${\text{Sr}}_{\text{2}}{\text{FeO}}_{\text{4}}$, so reinvestigation bilayer material...
Among materials suitable for flexible encapsulation poly-para-xylylene (Parylene C), often chosen as protective coating biomedical devices and variety of anticorrosion applications due to its favorable chemical biological resistance, high thermal stability, low water vapor absorption, permeability, biocompatibility well excellent dielectric mechanical properties, is one the most promising. In spite a wide use only few systematic studies on stability Parylene C have been carried out. this...
Spin-nematic and spin-smectic phases have been reported in magnetic materials, which break rotational symmetry while preserving translational along certain directions. However, until now the analogy to liquid crystals remained incomplete because no analog of cholesteric order was known. Here we show that bilayer perovskite Sr$_3$Fe$_2$O$_7$, previously believed adopt a simple single-$\mathbf{q}$ spin-helical order, hosts two distinct types multi-$\mathbf{q}$ spin textures first...
Abstract Topologically nontrivial magnetic structures such as skyrmion lattices are well known in materials lacking lattice inversion symmetry, where antisymmetric exchange interactions allowed. Only recently, topological multi- q textures that spontaneously break the chiral for example, three-dimensional hedgehog lattices, were discovered centrosymmetric compounds, they instead driven by frustrated interactions. Here we show bilayer perovskite Sr 3 Fe 2 O 7 , previously believed to adopt a...
Magnetic properties of polycrystalline Pr5Ge3 and Nd5Ge3 (hexagonal, Mn5Si3-type) compounds have been studied. Magnetization measurements in 0.5 T field indicate that the orders antiferromagnetically at 18 K (TN). However, an applied 10 mT, zero-field-cooled field-cooled magnetization bifurcates below ∼65 K. This positive paramagnetic Curie temperature, obtained from Curie–Weiss fit to susceptibility, suggest presence competing ferromagnetic antiferromagnetic interactions. The versus...
The rare mineral cyanochroite, K
The magnetic structure of GdMn₂Ge₂ (tetragonal I4/mmm) has been studied by hot neutron powder diffraction and x-ray resonant scattering techniques. These measurements, along with the results bulk experiments, confirm collinear ferrimagnetic moment direction parallel to c-axis below T(C) = 96 K antiferromagnetic phase in temperature region < T T(N) 365 K. In phase, detected at Mn Gd L₂ absorption edges. contribution is a result an induced 5d electron polarization caused order Mn-moments.
We report on the nonequilibrium monopole dynamics in classical spin ice ${\mathrm{Dy}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ detected by means of high-resolution magnetostriction measurements. Significant lattice changes occur at transition from kagome-ice to saturated-ice phase, visible longitudinal and transverse magnetostriction. A hysteresis opening temperatures below $0.6\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ suggests a first-order between kagome saturated state. Extremely slow...
The temperature- and field-induced magnetic phase transitions in pseudoternary systems Tb1−xYxMn2Ge2 Tb1−xYxMn2Si2, which are characterized by a separate ordering of the Mn Tb subsystems, have been studied on strongly textured samples magnetization thermal expansion measurements. In concentration region 0.4⩽x⩽1.0, where moments ordered only, structure is antiferromagnetic. subsystem accompanied transformation structure. As result, compounds show spontaneous magnetization. This transition...