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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.12: Poster
Monday, March 14, 2011, 14:00–18:00, P4
High resolution thermal expansion of isovalently doped BaFe2(As1−xPx)2 — •Anna Böhmer1,2, Philipp Burger1,2, Devang Joshi1, Frédéric Hardy1, Peter Schweiss1, Christoph Meingast1, Shigeru Kasahara3, Takahito Terashima3, Takasada Shibauchi4, and Yuji Matsuda4 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Fakultät für Physik, 76131 Karlsruhe, Germany — 3Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8501, Japan — 4Department of Physics, Kyoto University, Kyoto 606-8502, Japan
In the intensively studied 122-family of iron-based superconductors, superconductivity can be induced not only by charge-doping but also by isoelectronic substitution in the FeAs-layer ("chemical pressure") and by hydrostatic pressure.
We have performed high-resolution thermal expansion measurements between 5 K - 300 K on under- and optimally doped BaFe2(As1−xPx)2 single crystals with a Tc up to 30 K. They allow us to study the uniaxial pressure derivatives of their spin-density wave (structural) and superconducting transition temperatures. Parallels to electron doped Ba(Fe1−xCox)2As2 will be drawn. Structural parameters derived from four circle X-ray diffraction measurements contribute to our comparative study of physical pressure and P-doping in BaFe2As2.