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Dresden 2009 – scientific programme

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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 Buechner11Leibniz 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.

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