Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.29: Poster

Monday, March 11, 2013, 15:00–19:00, Poster D

Mössbauer and muon spin relaxation investigation of magnetic and superconducting properties of Ca_1−xNa_xFe₂As₂ — •Philipp Materne¹, Sirko Bubel¹, Hemke Maeter¹, Rajib Sarkar¹, Luminita Harnagea², Sabine Wurmehl², Bernd Büchner², 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. We have analyzed the data in terms of magnetic and superconducting properties and possible coexistence of superconductivity and spin density wave order. We compared our results with recently published data of Ba_1−xNa_xFe₂As₂ [1].
[1] H. Maeter et al., arXiv:1210.6881