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TT: Fachverband Tiefe Temperaturen

TT 45: Superconductivity: Ferropnictides 2

TT 45.4: Talk

Friday, March 27, 2009, 11:00–11:15, HSZ 03

Thermoelectric properties of undoped iron arsenides REOFeAs (RE = La, Ce, Pr, Sm, Gd) — •Agnieszka Kondrat¹, Jorge Enrique Hamann-Borrero¹, Norman Leps¹, Liran Wang¹, Martin Kosmala², Olaf Schumann², Jochen Werner¹, Guenter Behr¹, Markus Braden², Ruediger Klingeler¹, Hans-Henning Klauss³, Hubertus Luetkens⁴, Christian Hess¹, and Bernd Buechner¹ — ¹Leibniz Institute for Solid State and Materials Research Dresden, Germany — ²II. Physikalisches Institut, Universitaet zu Koeln, Germany — ³IFP, TU Dresden, Germany — ⁴Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen, Switzerland

Polycrystalline samples from the REOFeAs system were studied by means of electrical resistivity, thermal conductivity and thermoelectric power in temperature range 5-300K. All investigated compounds undergo a magnetic and a structural phase transition around 150K, which lead to profound anomalies in electrical, thermal and thermoelectric properties. We present the influence of substituting rare earth elements for La ion on the low temperature thermopower data. We discuss also the strong impact of magnetic field (B = 14T) on thermoelectric properties.