Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.23: Poster
Monday, March 22, 2010, 14:00–18:00, Poster A
Magnetic properties of CeFeAs1−xPxO iron pnictides studied by muon spin relaxation — •Johannes Spehling1, Hans-Henning Klauss1, Hemke Maeter1, Til Dellmann1, Hubertus Luetkens2, Alex Amato2, Anton Jesche3, Cornelius Krellner3, and Christoph Geibel3 — 1Institut für Festkörperphysik, TU Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — 3Max-Planck-Institut fürChemische Physik fester Stoffe Dresden, Germany
We have investigated the electronic phase diagram of the 1111 Fe-pnictide CeFeAs1−xPxO by means of muon spin relaxation (µSR). From resistivity and magnetic susceptibility a rich variety of electronic ground states including antiferromagnetism, ferromagnetism and superconductivity is inferred. We find that the examined compounds show a strong polarization of the rare earth moments by the long range ordered iron sublattice for x <= 0.4 and independent order of the Cerium-4f moments and short range ordered iron moments for x > 0.4. The peculiar interplay of the rare earth and iron magnetic order as a function of chemical pressure is examined. We further investigated the ground state properties of the heavy fermion system CeFePO.