A5077218029- Rare-earth and actinide compounds
- Inorganic Chemistry and Materials
- Topological Materials and Phenomena
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- X-ray Diffraction in Crystallography
- Graphene research and applications
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Crystallization and Solubility Studies
- 2D Materials and Applications
- Magnetic Properties of Alloys
- Multiferroics and related materials
- MXene and MAX Phase Materials
- Luminescence Properties of Advanced Materials
- Quantum and electron transport phenomena
- Crystal Structures and Properties
- Food composition and properties
- Inorganic Fluorides and Related Compounds
- Boron and Carbon Nanomaterials Research
- Catalysis and Oxidation Reactions
- Solid-state spectroscopy and crystallography
- Advanced Chemical Physics Studies
- Magnetic Properties and Applications
Max Planck Society
2013-2025
Max Planck Institute for Chemical Physics of Solids
2016-2025
Max Rubner Institut
2020-2024
Iwate University
2024
University of Cambridge
2024
Schmid (Germany)
2020
University College Cork
2016-2019
TU Dresden
1997-2019
Polish Academy of Sciences
2016
Peter the Great St. Petersburg Polytechnic University
2015
Abstract Weyl semimetals (WSMs) are topological quantum states wherein the electronic bands disperse linearly around pairs of nodes with fixed chirality, points. In WSMs, nonorthogonal electric and magnetic fields induce an exotic phenomenon known as chiral anomaly, resulting in unconventional negative longitudinal magnetoresistance, chiral-magnetic effect. However, it remains open question to which extent this effect survives when chirality is not well-defined. Here, we establish detailed...
The search for highly efficient and low‐cost catalysts is one of the main driving forces in catalytic chemistry. Current strategies catalyst design focus on increasing number activity local sites, such as edge sites molybdenum disulfides hydrogen evolution reaction (HER). Here, study proposes demonstrates a different principle that goes beyond site optimization by utilizing topological electronic states to spur activity. For HER, excellent have been found among transition‐metal...
Abstract Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite fact that majority related focuses on semiconducting transition-metal (for example, MoS 2 ), recently discovered unexpected properties WTe are provoking strong in semimetallic transition featuring large magnetoresistance,...
We report a comprehensive small angle neutron scattering study (SANS) of the magnetic phase diagram doped semiconductor Fe_{1-x}Co_{x}Si for x=0.2 and 0.25. For field parallel to beam we observe six-fold intensity pattern under field-cooling, which identifies A-phase as skyrmion lattice. The regime lattice is highly hysteretic extents over wide temperature range, consistent with site disorder Fe Co atoms. Our second material after MnSi in forms establishes that lattices may also occur...
Weyl and Dirac fermions have created much attention in condensed matter physics materials science. Recently, several additional distinct types of been predicted. Here, we report ultra-high electrical conductivity MoP at low temperature, which has recently established as a triple point Fermion material. Here show that the resistivity is 6 n-ohm cm 2 K with large mean free path 11 microns. de Haas-van Alphen oscillations reveal spin splitting Fermi surfaces. In contrast to noble metals similar...
We report on detailed magnetic measurements the cubic helimagnet FeGe in external fields and temperatures near onset of long-range order at ${T}_{C}=278.2(3)\text{ }\text{ }\mathrm{K}$. Precursor phenomena display a complex succession temperature-driven crossovers phase transitions vicinity ${T}_{C}$. The $A$-phase region, present below ${T}_{C}$ $H<0.5\text{ }\mathrm{kOe}$, is split several pockets. complexity diagram theoretically explained by confinement solitonic kinklike or...
Abstract The peculiar band structure of semimetals exhibiting Dirac and Weyl crossings can lead to spectacular electronic properties such as large mobilities accompanied by extremely high magnetoresistance. In particular, two closely neighboring points the same chirality are protected from annihilation structural distortions or defects, thereby significantly reducing scattering probability between them. Here we present transition metal diphosphides, WP 2 MoP , which type-II with robust...
Hexagonal $\ensuremath{\alpha}$-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane successive order at ${T}_{1}=14\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ ${T}_{2}=8\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ could be completely suppressed, whereas perpendicular direction is robust. Furthermore, field dependence of $\ensuremath{\chi}(\mathrm{T})$ implies coexisting ferro- antiferromagnetic exchange between...
Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal crossings with linear dispersion are expected to have at most |C|=4, which sets an upper limit magnitude of many phenomena in these materials. Here we show that chiral crystal PdGa displays multifold crossings, connected exactly four surface Fermi-arcs, thus proving they carry maximal 4. By comparing two enantiomers, observe reversal their Fermi-arc...
Single crystals of Ba(8)Au(5.3)Ge(40.7) [space group Pm(3)n (No. 223), a = 10.79891(8) Å] were prepared by Bridgman technique. The crystal structure refinement based on single-crystal X-ray diffraction data does not reveal any vacancies in the Au/Ge framework or cages. In addition to ionic bonding between Ba and anionic framework, direct interaction Au atoms was identified applying electron localizability indicator. As expected chemical-bonding picture, is diamagnet shows p-type electrical...
Recently, the existence of massless chiral (Weyl) fermions has been postulated in a class semi-metals with non-trivial energy dispersion.These materials are now commonly dubbed Weyl (WSM).One predicted property is or Adler-Bell-Jackiw anomaly, chirality imbalance presence parallel magnetic and electric fields. In WSM, it expected to induce negative longitudinal magnetoresistance (NMR), effect.Here, we present experimental evidence that observation effect can be hindered by an called "current...
Engineering lattice thermal conductivity requires to control the heat carried by atomic vibration waves, phonons. The key parameter for quantifying it is phonon lifetime, limiting travelling distance, whose determination however at limits of instrumental capabilities. Here, we show achievement a direct quantitative measurement lifetimes in single crystal clathrate Ba7.81Ge40.67Au5.33, renowned its puzzling 'glass-like' conductivity. Surprisingly, transport dominated acoustic phonons with...
One of the hallmarks Weyl semi-metals is existence unusual topological surface states known as 'Fermi arcs' [1-3]. The formation these guaranteed by bulk points with opposite chirality. Tantalum Arsenide (TaAs) [4-9], a member newly discovered family [4,5], harbors host non-topological ('trivial') overlapping in energy predicted 12 arcs'. This overlap poses major challenge identifying signatures arcs [10]. Here we harness inherently distinct spatial structure trivial and Fermi arc to...
Abstract Magnetic skyrmions are stable topological solitons with complex non-coplanar spin structures. Their nanoscopic size and the low electric currents required to control their motion has opened a new field of research, skyrmionics, that aims for usage as information carriers. Further advances in skyrmionics call thorough understanding three-dimensional (3D) texture, skyrmion–skyrmion interactions coupling surfaces interfaces, which crucially affect skyrmion stability mobility. Here, we...
We report on detailed polarized small-angle neutron scattering cubic FeGe in magnetic fields applied either along (transverse) the vector or parallel (longitudinal) to beam. The ($H$, $T$) phase diagrams for all principal axes contain a segmented $A$-phase region just below onset of order. Hexagonal Bragg-spot patterns were observed across entire longitudinal geometry. Scattering intensity was parts $A$ both configurations. Only distinct pocket (${A}_{1}$) vanishing found transverse
Abstract NbP is a recently realized Weyl semimetal (WSM), hosting points through which conduction and valence bands cross linearly in the bulk exotic Fermi arcs appear. The most intriguing transport phenomenon of WSM chiral anomaly-induced negative magnetoresistance (NMR) parallel electric magnetic fields. In intrinsic lie far from energy, making magneto-transport elusive. Here, we use Ga-doping to relocate energy sufficiently close W2 points, for different surfaces are verified by resultant...
The lack of inversion symmetry in the crystal lattice magnetic materials gives rise to complex noncollinear spin orders through interactions a relativistic nature, resulting interesting physical phenomena, such as emergent electromagnetism. Studies cubic chiral magnets revealed universal phase diagram composed helical spiral, conical and skyrmion phases. We report remarkable deviation from this behavior. By combining neutron diffraction with magnetization measurements, we observe new...
Transport and ARPES reveal extremely good metallicity arising from almost free-electron behavior in single-crystal PtCoO 2 .