Publications database

The phylogenetic relationships of the small-bodied catarrhine Pliobates cataloniae (~11.6 Ma, NE IberianPeninsula) have been controversial since its original description. However, the recent report of additionaldentognathic remains has supported its crouzeliid pliopithecoid status. [...]

Magnetic rare-earth ortheferrites of the RFeO3 type (R = rare earth element, model systems for studies and theoretical considerations on magnetic structures in sixties of the last century [[Whi69, Mar70, Ber68], have regained significant interest in the last decade. Their complex multiferroic and magnetocaloric features make them potential candidates for modern applications, e.g. [...]

The single crystal diffractometer HEiDi (jointly operated by RWTH Aachen University and the Forschungszentrum Jülich) at the research neutron source FRM II at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching offers a broad spectrum of thermal and hot neutrons, high neutron flux, high resolution and a large access to reciprocal space, low absorption and high sensitivity for light elements. Especially its last features makes HEiDi a valuable tool for extended studies on different materials and components relevant for applications in the field of energy research [...]

Single crystal neutron diffraction, especially with hot neutrons, supports various grand challenges in research as well as method developments. In regard to this the instrument HEiDi at the hot source of FRM II offers features like fast and high quality Bragg data collections up to very large Q (> 20/Å for λ=0.56Å) within a broad temperature range (2K < T < 1300K) and offers since 2019 also high pressure experiments (p < 10 GPa).The full exploitation of these options and the safe support of 24h/7d user operation requires a highly flexible and autonomous software for device control and data acquisition. [...]

We advertise rare-earth intermetallics with high-symmetry crystal structures and competing interactions as a possible materials platform hosting spin structures with non-trivial topological properties. Focusing on the series of cubic RCu compounds, where R = Ho, Er, Tm, the bulk properties of these systems display exceptionally rich magnetic phase diagrams hosting an abundance of different phase pockets characteristic of antiferromagnetic order in the presence of delicately balanced interactions. [...]

Moisture usually deteriorates polymers’ mechanical performance owing to its plasticizing effect, causing side effects in their practical load-bearing applications. Herein, a simple binary ionogel consisting of an amphiphilic polymer network and a hydrophobic ionic liquid (IL) is developed with remarkable stiffening effect after moisture absorption, demonstrating a complete contrast to water-induced softening effect of most polymer materials. [...]

The effect of embedded graphitic carbon nitride (g-C3N4) nanosheets on hydration and thermal response behavior of cross-linked thermoresponsive poly(di(ethylene glycol) methyl ether methacrylate-co-oligo(ethylene glycol) methyl ether methacrylate), abbreviated as P(MA-co-MA300), thin films is probed by white light interferometry. Compared with that of the cross-linked pure P(MA-co-MA300) films, the surface roughness of the cross-linked hybrid films is slightly increased, which is caused by the minor aggregation of g-C3N4 nanosheets during the spin-coating process. [...]

The magnetovolume effect is a well established yet frequently overlooked phenomenon in magnetic materials that may affect a wide range of physical properties. Our study explores the influence of the magnetovolume effect on the transient reflectivity of MnSi, a well-known chiral magnet with strong magnetoelastic coupling. [...]

We report on the origin of spin freezing in the disordered fluorite Ho2⁢Zr2⁢O7. The system is investigated by low-temperature heat capacity as well as by dc and ac magnetization. [...]