Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: Ferropnictides 2
TT 45.2: Talk
Friday, March 27, 2009, 10:30–10:45, HSZ 03
Magnetic and Thermodynamic studies on iron based superconductors RFeAsO1−xFx (R=La, Ce, Pr, Sm, Gd) — •Norman Leps1, Rüdiger Klingeler1, Christian Hess1, Agnieszka Kondrat1, Jorge Hamann Borrero1, Liran Wang1, Günter Behr1, Hans-Henning Klauss3, Hubertus Luetkens2, and Bernd Büchner1 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland — 3IFP, TU Dresden, D-01069 Dresden, Germany
We present specific heat and magnetisation data of RFeAsO1−xFx with R=La, Ce, Pr, Sm, Gd in different applied magnetic fields. For the undoped compounds, i.e. x=0, our data indicate only a weak dependence of both the spin-density-wave formation and the structural transition to the orthorhombic low-temperature phase on type of the R-ion. If R is magnetic, antiferromagnetic ordering of 4f-moments evolves at low temperatures which is also present at higher doping levels x for superconducting materials. The specific heat jump Δ cp at TC is investigated and we discuss the interplay of magnetism and superconductivity based on our data.