Correlated systems

In this context we are searching for new compounds with correlations. Systems under investigations are Nanographenes in collaboration with Müllen (MPI-P, Mainz), Alkalimetalloxides (Jansen, MPI, Stuttgart), GdI₂ (Simon, MPI, Stuttgart) Nickelates (Greenblatt, Rutgers) Oxochlorides (Cava, Princeton), cerium compounds (von Löhneysen, Karlsruhe) and valence fluctuations (Wortmann, Paderborn). A high light of our research are our recent results on mixed valent Rubidiumhyperoxidperoxid. Exotic, anionogenic magnetism and correlation can be found in the Alkali-Oxygensystem Rb₄O₆. In collaboration we will apply high pressure to compounds, in which we can not achieve a metal to insulator transition by substitution of elements

 

Key papers and collaborators:
Electronic properties, band structure and Fermi surface instabilities of Ni¹⁺/Ni²⁺₃Ni₂O₆, isoelectronic with superconducting cuprates; nickelate, La Viktor V. Poltavets, Gerhard H. Fecher and Claudia Felser; Martha Greenblatt, Phys. Rev. Lett. 102 (2009) 046405.
Challenge of Magnetism in Strongly Correlated Open-Shell 2_p Systems
J. Winterlik, G. H. Fecher, C. A. Jenkins, C. Felser, C. Mühle, K. Doll, M. Jansen, L. M. Sandratskii, J. Kübler, Phys. Rev. Lett. 102 (2009) 016401.
Refinement of the crystal structures of strontium cobalt oxychlorides by neutron powder diffraction,
S.M. Loureiro, C. Felser, Q. Huang, R. J. Cava, Chem. Mater. 12 (2000) 318

 

Collaborations:
Klaus Müllen (MPI Mainz), Mikhail Eremets (MPI Chemie Mainz); Bernd Büchner (Dresden), Jürgen Kübler (Darmstadt)

 

International Collaborations:
R.J . Cava, (Princeton), Martha Greenblatt (Rutgers) David Singh (Oak Ridge)