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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.22: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Magnetic properties of CeFeAs_1−xP_xO iron pnictides studied by Moessbauer spectroscopy — •Ph. Materne¹, J. Spehling¹, H.-H. Klauss¹, T. Dellmann¹, H. Maeter¹, H. Luetkens², R. Khasanov², A. Amato², A. Jesche³, C. Krellner³, and C. Geibel³ — ¹Institut für Festkörperphysik, TU Dresden — ²Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ³Max-Planck-Institut für Chemische Physik fester Stoffe Dresden

The iron pnictide system CeFeAs_1−xP_xO (0≤ x≤1) exhibits a rich variety of electronic ground states ranging from coexisting long-range antiferromagnetic (AF) Fe-3d SDW order with AF Ce-4f order at low doping levels to short-range static Fe order with long-range FM Ce order for the midregime (0.34≤ x≤0.9) to finally a non-magnetic ground state for high phosphorus concentrations, i.e. x>0.9. By means of Moessbauer spectroscopy we determined the magnetic hyperfine field at the Fe site for representative phosphorus compositions. Our Moessbauer data are discussed in comparizon with results obtained from recent muon spin relaxation measurements.