A5038209232- Rare-earth and actinide compounds
- Iron-based superconductors research
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Electronic and Structural Properties of Oxides
- Magnetic Properties of Alloys
- Multiferroics and related materials
- Corporate Taxation and Avoidance
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Graphene research and applications
- Superconductivity in MgB2 and Alloys
- Luminescence Properties of Advanced Materials
- Inorganic Chemistry and Materials
- Solid-state spectroscopy and crystallography
- 2D Materials and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear materials and radiation effects
- Quantum, superfluid, helium dynamics
Paul Scherrer Institute
2016-2025
Polish Academy of Sciences
2012-2024
Institute of Physics
2010-2024
Łukasiewicz Research Network - Institute of Non-Ferrous Metals
2018
Instytut Gruźlicy i Chorób Płuc
2011
Abstract A Weyl semimetal possesses spin-polarized band-crossings, called nodes, connected by topological surface arcs. The low-energy excitations near the crossing points behave same as massless fermions, leading to exotic properties like chiral anomaly. To have transport dominated nodes need locate nearly at chemical potential and enclosed pairs of individual Fermi surfaces with non-zero Chern numbers. Combining angle-resolved photoemission spectroscopy first-principles calculation, here...
Magnetic topological phases of quantum matter are an emerging frontier in physics and material science. Along these lines, several kagome magnets have appeared as the most promising platforms. However, magnetic nature materials presence state remains unsolved issue. Here, we explore correlations magnet Co_3Sn_2S_2. Using muon spin-rotation, present evidence for competing orders lattice this compound. Our results show that while sample exhibits out-of-plane ferromagnetic ground state,...
We report the discovery of topological magnetism in candidate magnetic Weyl semimetal CeAlGe. Using neutron scattering we find this system to host several incommensurate, square-coordinated multi-k[over →] phases below T_{N}. The properties a phase stable at intermediate fields parallel c axis are suggested by observation Hall effect. Our findings highlight CeAlGe as an exceptional for exploiting interplay between nontrivial topologies magnetization real space and nodes momentum space.
To trace the origin of time-reversal symmetry breaking (TRSB) in Re-based superconductors, we performed comparative muon-spin rotation/relaxation ($\mu$SR) studies superconducting noncentrosymmetric Re$_{0.82}$Nb$_{0.18}$ ($T_c = 8.8$ K) and centrosymmetric Re 2.7$ K). In Re$_{0.82}$Nb$_{0.18}$, low temperature superfluid density electronic specific heat evidence a fully-gapped state, whose enhanced gap magnitude specific-heat discontinuity suggest moderately strong electron-phonon coupling....
We report the observation of anomalous Hall resistivity in single crystals EuAl$_4$, a centrosymmetric tetragonal compound, which exhibits coexisting antiferromagnetic (AFM) and charge-density-wave (CDW) orders with onset at $T_\mathrm{N} \sim 15.6$ K $T_\mathrm{CDW} 140$ K, respectively. In AFM state, when magnetic field is applied along $c$-axis direction, EuAl$_4$ undergoes series metamagnetic transitions. Within this range, we observe clear hump-like anomaly resistivity, representing...
Abstract The role of the perovskite lattice oxygen in evolution reaction (OER) is systematically studied PrBaCo 2 O 5+δ family. reduced number physical/chemical variables combined with in‐depth characterizations such as neutron dif‐fraction, K‐edge X‐ray absorption spectroscopy (XAS), electron energy loss (EELS), magnetization and scanning transmission microscopy (STEM) studies, helps investigating complex correlation between OER activity a single property, content. Larger amount vacancies...
We report on systematic muon-spin rotation and relaxation ($\mu$SR) studies of the magnetic properties EuAl$_4$ EuGa$_4$ single crystals at a microscopic level. Transverse-field $\mu$SR measurements, spanning wide temperature range (from 1.5 to 50 K), show clear bulk AFM transitions, with an almost 100% volume fraction in both cases. Zero-field covering paramagnetic (PM) states, reveal internal fields $B_\mathrm{int}(0) = 0.33$ T 0.89 EuGa$_4$, respectively. The transverse rate...
Abstract Charge ordered kagome lattices have been demonstrated to be intriguing platforms for studying the intertwining of topology, correlation, and magnetism. The recently discovered charge material ScV 6 Sn does not feature a magnetic groundstate or excitations, thus it is often regarded as conventional paramagnet. Here, using advanced muon-spin rotation spectroscopy, we uncover an unexpected hidden magnetism order. We observe enhancement internal field width sensed by muon ensemble,...
Abstract Magnetic skyrmions, topological vortex-like spin textures, garner significant interest due to their unique properties and potential applications in nanotechnology. While they typically form a hexagonal crystal with distinct internal magnetisation textures known as Bloch- or Néel-type, recent theories suggest the possibility for direct transitions between skyrmion crystals of different lattice structures textures. To date however, experimental evidence these potentially useful...
Abstract A state of matter with a multi-component order parameter can give rise to vestigial order. In the phase, primary is only partially melted, leaving remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due spin and charge-density-wave have been discussed in iron-based cuprate materials. Here we present observation melted superconductivity which pairing fluctuations condense at separate phase transition form nematic broken Z...
Abstract The unveiling of superconductivity in La 3 Ni 2 O 7-δ under pressure, following the suppression a high-temperature density wave (DW) state, has attracted considerable attention. Notably, nature this competing DW order remains elusive, presenting crucial question that demands further investigation. Here, we employ muon-spin rotation/relaxation ( μ SR) technique combined with dipole-field numerical analysis to probe magnetic response as function hydrostatic pressure. At ambient SR...
Superconducting single crystals of pure FeTe1 − xSex and FeTe0.65Se0.35 doped with Co, Ni, Cu, Mn, Zn, Mo, Cd, In, Pb, Hg, V, Ga, Mg, Al, Ti, Cr, Sr or Nd into Fe ion sites have been grown applying Bridgman's method. It has found that the sharpness transition to superconducting state in is evidently inversely correlated crystallographic quality crystals. Among all studied dopants only Ni Cu substitute ions The remaining examined do not incorporate crystal structure. Nevertheless, they form...
We investigate the band structure of BaBiO_{3}, an insulating parent compound doped high-T_{c} superconductors, using in situ angle-resolved photoemission spectroscopy on thin films. The data compare favorably overall with density functional theory calculations within local approximation, demonstrating that electron correlations are weak. bands exhibit Brillouin zone folding consistent known BiO_{6} breathing distortions. Though distortions often thought to coincide Bi^{3+}/Bi^{5+} charge...
Superconducting materials with a nontrivial band structure are promising candidates in the search for topological superconductivity. The rocksalt carbides NbC and TaC two fully gapped superconductors relatively high critical temperatures (${T}_{c}$ = 11.0 10.3 K, respectively). They exhibit three closed node lines bulk protected by time-reversal space-inversion symmetry. By combining muon spin rotation relaxation investigations theoretical calculations, authors demonstrate that is potential...
Topological semimetals are three dimensional materials with symmetry-protected massless bulk excitations. As a special case, Weyl nodal-line realized in either having no inversion or broken time-reversal symmetry and feature nodal lines. The 111-family of materials, LaNiSi, LaPtSi LaPtGe (all lacking symmetry), belong to this class. Here, by combining muon-spin rotation relaxation thermodynamic measurements, we find that these exhibit fully-gapped superconducting ground state, while...
We report the discovery of Zr$_3$Ir as a new type unconventional noncentrosymmetric superconductor (with $T_c = 2.3$ K), here investigated mostly via muon-spin rotation/relaxation ($\mu$SR) techniques. Its superconductivity was characterized using magnetic susceptibility, electrical resistivity, and heat capacity measurements. The low-temperature superfluid density, determined transverse-field $\mu$SR electronic specific heat, suggests fully-gapped superconducting state. spontaneous fields,...
Abstract Motivated by the recent discovery of superconductivity in infinite-layer nickelate thin films, we report on a synthesis and magnetization study bulk samples parent compounds R NiO 2 ( = La, Pr, Nd). The frequency-dependent peaks alternating current magnetic susceptibility, along with remarkable memory effects, characterize spin-glass states. Furthermore, various phenomenological parameters via different spin glass models show strong similarity within these three as well other...
The electronic properties of transition-metal oxides with highly correlated electrons are central importance in modern condensed matter physics and chemistry, both for their fundamental scientific interest, potential advanced applications. design materials tailored has been, however, restricted by the limited understanding structure-property relationships, which particularly complex proximity regime where localized become gradually mobile. RENiO3 perovskites, characterized presence...
Crystalline symmetry is a defining factor of the electronic band topology in solids, where many-body interactions often induce spontaneous breaking symmetry. Superconductors lacking an inversion center are among best systems to study such effects or even achieve topological superconductivity. Here, we demonstrate that TRuSi materials (with T transition metal) belong this class. Their bulk normal states behave as three-dimensional Kramers nodal-line semimetals, characterized by large...
Abstract The kagome lattice is an intriguing and rich platform for discovering, tuning understanding the diverse phases of quantum matter, crucial advancing modern future electronics. Despite considerable efforts, accessing correlated at room temperature has been challenging. Using single-crystal X-ray diffraction, we discovered charge order above in La(Ru 1− x Fe ) 3 Si 2 ( = 0, 0.01, 0.05), where related to out-of-plane Ru atom displacements appears below T CO,I ≃ 400 K. secondary ordered...
In this paper, we address a number of outstanding issues concerning the nature and role magnetic inhomogeneities in iron chalcogenide system FeTe1−xSex their correlation with superconductivity system. We report morphology superconducting single crystals FeTe0.65Se0.35 studied transmission electron microscopy, high-angle annular dark-field scanning microscopy properties characterized magnetization, specific heat resonance spectroscopy. Our data demonstrate presence nanoscale hexagonal regions...
The Weyl semimetal phase is a recently discovered topological quantum state of matter characterized by the presence topologically protected degeneracies near Fermi level. These are source exotic phenomena, including realization chiral fermions as quasiparticles in bulk and formation arc states on surfaces. Here, we demonstrate that these two key signatures show distinct evolutions with band topology performing angle-resolved photoemission spectroscopy, supported first-principles...
We report a comprehensive study of the noncentrosymmetric superconductor ${\mathrm{Mo}}_{3}\mathrm{P}$. Its bulk superconductivity, with ${T}_{c}=5.5\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, was characterized via electrical-resistivity, magnetization, and heat-capacity measurements, while its microscopic electronic properties were investigated by means muon-spin rotation/relaxation ($\ensuremath{\mu}\mathrm{SR}$) nuclear magnetic resonance (NMR) techniques. In normal state, NMR relaxation...