Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Superconductivity: Poster Session
TT 21.14: Poster
Montag, 16. März 2015, 15:00–18:00, Poster B
Pressure and field dependence of superconductivity in RbFe2As2 — •Pascal Reiss1, Konstantin Semeniuk1, Philip Brown1, Kai Grube2, Thomas Wolf2, Peter Adelmann2, Hilbert von Löhneysen2, and F Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom — 2Institut für Festkörperphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Deutschland
RbFe2As2 is a member of the extensively investigated family of 122 iron based superconductors AFe2As2. It acts as the link between A=K and Cs, and as extremal hole-doping for A=Sr and Ba. The nature of the superconducting state in these compounds is still open, but likely to feature different nodal gap structures.
We report resistivity measurements of very pure (RRR > 1000) crystals of RbFe2As2. Superconductivity at ambient pressure and zero field is observed below 2.8K. We follow this transition and the upper critical field as a function of hydrostatic pressure up to 30 kbar.
Furthermore we observe a non-Fermi liquid form for the temperature dependence of the resistivity in the normal state, which we track as a function of pressure and applied magnetic field.