Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.13: Vortrag
Mittwoch, 13. März 2013, 12:45–13:00, H18
Local Mn character and P-derived ligand-hole states in LaMnPO — •Nils Hollmann1, Anna Efimenko1, Zhiwei Hu1, Maurits Haverkort2, Jack Simonson3, Hong-Ji Lin4, Chien-Te Chen4, Zhiping Yin5, Meigan Aronson3, and Liu Hao Tjeng1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada — 3Department of Physics and Astronomy, Stony Brook University, Stony Brook, USA — 4National Synchrotron Radiation Research Center, Hsinchu, Taiwan — 5Department of Physics and Astronomy, Rutgers, USA
We have investigated the electronic structure of LaMnPO by means of x-ray absorption and photoelectron spectroscopy, as well as LDA+U bandstructure calculations. From the spectroscopy, we found that the Mn ions have local moments and we also observed the strong presence of P-derived ligand hole states. Using LDA+U, we investigate how pressure can first make the system metallic while retaining local moments before entering a metallic state with weak delocalized moments. We also investigate theoretically how electron doping can quench the magnetism as to perhaps facilitate superconductivity like it is present in the Fe compounds.