A5065468345- Rare-earth and actinide compounds
- Iron-based superconductors research
- Corporate Taxation and Avoidance
- Advanced MRI Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Atomic and Subatomic Physics Research
- Advanced Sensor and Energy Harvesting Materials
- Physics of Superconductivity and Magnetism
- NMR spectroscopy and applications
- Advanced Battery Materials and Technologies
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Advancements in Battery Materials
- Near-Field Optical Microscopy
- Advanced Battery Technologies Research
Leibniz Institute for Solid State and Materials Research
2020-2024
The identification of electronic nematicity across series iron-based superconductors raises the question its relationship with superconductivity and other ordered states. Here, we report a systematic elastoresistivity study on LaFe$_{1-x}$Co$_x$AsO single crystals, which have well separated structural magnetic transition lines. All crystals show Curie-Weiss-like nematic susceptibility in tetragonal phase. extracted temperature is monotonically suppressed upon cobalt doping, changes sign...
Tunable electromagnets and corresponding devices, such as magnetic lenses or stigmators, are the backbone of high-energy charged particle optical instruments, electron microscopes, because they provide higher power, stability, lower aberrations compared to their electric counterparts. However, typically macroscopic (super-)conducting coils, which cannot generate swiftly changing fields, require active cooling, structurally bulky, making them unsuitable for fast beam manipulation, multibeam...
Abstract Several attempts are made to downscale nuclear magnetic resonance (NMR) spectroscopy systems and enable high resolution chemical analysis of small sample quantities. However, miniaturization is nontrivial due stringent demands on precise analyte sampling within the detector while performing local excitation signal detection with a microsized coil. Imperfect coil geometry inhomogeneities in coil's surrounding environment have detrimental impact quality, hampering further development...
We present $^{75}$As Nuclear Magnetic and Quadrupole Resonance results (NMR, NQR) on a new set of LaFeAsO$_{1-x}$F$_x$ polycrystalline samples. Improved synthesis conditions led to more homogenized samples with better control the fluorine content. The structural$\equiv$nematic, magnetic, superconducting transition temperatures have been determined by NMR spin-lattice relaxation rate AC susceptibility measurements. so-determined phase diagram deviates from published one especially for low...
In this work we revisit the phase diagram of Co-doped LaFeAsO using single crystals and thermodynamic methods. From magnetic susceptibility studies track doping evolution antiferromagnetic phase, revealing a continuous suppression $T_\mathrm{N}$ up to 5$\%$ Co doping. order study so-called nematic temperature dependence lengths changes along $a$ $b$ orthorhombic directions, $\Delta L/L_0$, was determined by high-resolution capacitance dilatometry. The results clearly show gradual reduction...
We determine the phase diagram of ${\mathrm{LaFe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{AsO}$ single crystals by using nuclear magnetic resonance (NMR). Up to a nominal doping $x=0.03$, it follows for F-doped polycrystals. Above samples become superconducting, whereas Co structural and transitions can be observed up $x=0.042$, superconductivity occurs only higher levels with reduced transition temperatures. For dopings $x=0.056$, we find evidence short-range order. By means...