Stefanie Siebeneichler

Stefanie Siebeneichler

Research Topic:

Elucidation of Complex Magnetic Structures via Neutron Scattering

Contact: stefanie.siebeneichler(at)


Siebeneichler’s PhD project focuses on the study of complex magnetic structures in transition metal phosphates and intermetallic systems. Both material groups can exhibit complex magnetic behavior but for different reasons. The magnetic ions of the transition metal phosphates frequently form geometrically frustrated lattices. In combination with the commonly occurring antiferromagnetic interactions this leads to geometric frustration. As a result, one can observe magnetic properties which do not exist in non-frustrated magnets such as non-collinear and coplanar magnetic structures. In contrast to insulators, the dominant interaction mechanisms in intermetallic systems are direct exchange or RKKY interactions. Therefore, classical “geometric frustration” is less common. Instead, one can observe complex magnetic behavior due to competing interactions. The resulting magnetic structures, however, are by no means less complex. In several of our systems we have observed incommensurability and non-collinearity even on non-frustrated lattices.

The key technique of Siebeneichler’s research is neutron diffraction as it allows the study of magnetic structures at the atomic level.


  1. Annual SwedNess/SNSS meeting (April 23-26 2018, Göteborg): poster presentation
  2. 10th International School and Conference on Physics and Applications of Spin Phenomena in Solids (August 05-09, 2018, Linz, Austria): poster presentation
  3. Annual SwedNess/SNSS meeting (May 6-8, 2019, Stockholm): Talk about “Neutron diffraction studies of magnetic and superconducting intermetallic compounds”
  4. Magnetic Crystallography summer school (2019/05/31-06/09, Italy): Talk and Poster on “Composition and temperature dependent evolution of magnetism in the solid solution LaMn2Si2-xGex
  5. G Wang, M Valldor, S Siebeneichler, M Wilk-Kozubek, V Smetana,  A-V Mudring. Ionothermal Synthesis, Structures, and Magnetism of Three New Open Framework Iron Halide-Phosphates. Inorganic Chemistry 2019 58 (19), 13203-13212. DOI: 10.1021/acs.inorgchem.9b02028
  6. S Siebeneichler, KV Dorn, V Smetana, M Valldor, A-V Mudring. A soft chemistry approach to the synthesis of single crystalline and highly pure (NH4)CoF3 for optical and magnetic investigations. The Journal of Chemical Physics 2020 153 (10), 104501. DOI: 10.1063/5.0023343