Conveners
Crystal Physics
- Matthias Zschornak
Oleic acid-coated nanoparticles were prepared by coprecipitation method in one step. The cationic distribution among tetrahedral and octahedral sites of Co2+ and Fe3+ was determined by Rietveld method and the inversion degree represented by concentration of Co2+ in tetrahedral site was found to be 0.4. Magnetic characterization at theree different temperature revealed the super-paramagnetic behaviour.
Small-angle neutron scattering is used in combination with transport measurements to study the current-induced effects on the morphology of the intermediate mixed state in the intertype superconductor niobium. We report the robust self-organisation of the vortex lattice domains to elongated parallel stripes perpendicular to the applied current in a steady-state. Our experimental results are...
In a previous series of experiments to decipher the number of existing ternary phases in K2O-CaO-SiO2 system, we proved the presence of K4CaSi6O15 as a stable compound at ambient conditions and solved its crystal structure. Recently, we further revealed that the compound undergoes two structural phase transitions with increasing temperature.Diffraction data collected between 462 K and 666 K...
Various spin-canting sublattices at three unique Mn sites in the ferrimagnetic phase (C2'/c') of Mn2+5(PO4)2(PO3(OH))2(HOH)4 (C2/c) explains a weak ferromagnetism. Below the Curie temperature (6.17 k), magnetic spin-canting reorientations continuously proceed. This vivid spin dynamic system could be confirmed by ac magnetic susceptibility under oscillating magnetic within a frequency window of...
The existence of a vortex phase with non-trivial topological properties in an antiferromagnetic incommensurate magnet Ba₂CuGe₂O₇ has been verified, by means of neutron scattering and bulk measurements of specific heat and AC susceptibility. Despite lacking evidence of any signature of a phase transition in the bulk magnetisation and specific heat measurements, hints towards the presence of a...
