Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Superconductivity: Fe-based Superconductors – 122 and 111
TT 31.6: Vortrag
Dienstag, 17. März 2015, 11:15–11:30, H 2053
Strain effect on the phase diagram of Ba-122 — Kazumasa Iida1,2, •Vadim Grinenko1, Fritz Kurth1, Dmitriy Efremov1, Stefan-Ludwig Drechsler1, Marco Langer1,3, Jan Engelmann1, Ataru Ichinose4, Ichiro Tsukada4, Eike Ahrens5, Saicharan Aswartham1, Sabine Wurmehl1, Ingolf Mönch1, Manuela Erbe1,3, Jens Hänisch1,3, Bernhard Holzapfel1,3, Hiroshi Ikuta2, and Ruben Hühne1 — 1IFW Dresden, Germany — 2Nagoya University, Japan — 3Karlsruhe Institute of Technology (KIT), Germany — 4Central Research Institute of Electric Power Industry, Nagasaka, Japan — 5TU Dresden, Germany
Thin films offer a possibility for tuning superconducting (SC) properties without external pressure or chemical doping. In-plane strain controls the Neél temperature of the antiferromagnetic (AF) transition and the SC transition temperature or even induce superconductivity in the parent compound [1]. We studied the electronic and magnetic properties of Co, Ru, and P doped Ba-122 thin films in different strain states. We have found that the strain shifts nearly rigidly the whole phase diagram including the AF region and the SC dome in the direction of higher or lower substitution levels depending on the direction of strain (i.e. compressive or tensile). In particular, we found that the strain affects the band structure similarly as Co doping despite that the crystal structure changes differently. As a result tensile or compressive strain acts as additional el or h doping, respectively.
[1] APL 95, 192501 (2009); 102, 142601 (2013);
Nat. Commun. 4, 2877 (2013).