Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 53: Superconductivity: Fe-based Superconductors - 122

TT 53.4: Talk

Wednesday, April 2, 2014, 10:15–10:30, HSZ 201

Coupled order parameters in Ca_1−xNa_xFe₂As₂ — •Philipp Materne¹, Sirko Bubel¹, Hemke Maeter¹, Rajib Sarkar¹, Johannes Spehling¹, Luminita Harnagea², Sabine Wurmehl^2,1, Bernd Buechner^2,1, Hubertus Luetkens³, and Hans-Henning Klauss¹ — ¹Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²IFW Dresden, Postfach 270016, 01171 Dresden, Germany — ³Paul-Scherrer-Institut, 5232 Villigen, Switzerland

The antiferromagnetic parent compound, CaFe₂As₂, shows a supression of the spin density wave and a subsequent superconducting state upon partial substitution of Ca by Na. Along the substitution series, superconducting transition temperatures up to ≈35 K were found. We studied the electronic phase diagram of Ca_1−xNa_xFe₂As₂ using Mössbauer spectroscopy and muon spin relaxation experiments in terms of order parameter interaction in the coexistence region as well as electronic properties in the pure magnetic and superconducting parts of the phase diagram. The results were compared with recently published data of Ba_1−xNa_xFe₂As₂ [1].