Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.39: Poster

Montag, 31. März 2014, 15:00–19:00, P2

The electronic phase diagram of Ba_1−xRb_xFe₂As₂ investigated by thermodynamic measurements — •D. Gruner¹, F. Steckel¹, V. Grinenko¹, S. Aswartham¹, C. Hess¹, A. U. B. Wolter¹, S. Wurmehl^1,2, and B. Büchner^1,2 — ¹Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden, Germany — ²Institute for Solid State Physics, TU Dresden, 01062 Dresden, Germany

After the discovery of a spin-density-wave (SDW) anomaly at 140 K in BaFe₂As₂ by Rotter et al., superconductivity (SC) was achieved in this material by hole-doping with potassium [1]. Since RbFe₂As₂ shows bulk SC at 2.6 K [2], via a partial substitution of Ba with Rb in Ba122 the crossover from SC to magnetism can be studied in detail. We have synthesized single crystals of Ba_1−xRb_xFe₂As₂ by using the self-flux high temperature solution growth technique. Via AC-susceptibility, specific heat and electrical resistivity measurements the SDW and superconducting behavior was investigated. The corresponding electronic phase diagram of Ba_1−xRb_xFe₂As₂ has been constructed. While the substitution of Ba²⁺ with Rb⁺ ions suppresses the SDW anomaly, SC is induced. A superconducting transition as high as ≈ 37.3 K is reached for an Rb content of x≈ 0.3. This T_c is comparable to K-doped Ba-122 with x=0.4 and T_c=38 K reported previously [3].
M. Rotter, M. Tegel, and D. Johrendt, Phys. Rev. Lett. 101, 107006 (2008)
Z. Bukowski et al., Physica C. 470, Supplement 1, S328 - S329 Superconductivity, (2010)
S. Avci et al., Phys. Rev. B. 85, 184507 (2012)