Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Superconductivity: Fe-based Superconductors - 122
TT 79.6: Vortrag
Donnerstag, 10. März 2016, 16:45–17:00, H21
Charge dynamics of BaFe2(As1−xPx)2: infrared spectroscopy study under pressure — •Ece Uykur1, Tatsuya Kobayashi2, Wataru Hirata2, Shigeki Miyasaka2, Setsuko Tajima2, and Christine Kuntscher1 — 1Experimentalphysik II, Universität Augsburg, D-86195 Augsburg, Germany — 2Department of Physics, Graduate School of Science, Osaka University, Osaka 560-0043, Japan
Temperature-dependent reflectivity measurements under pressure (up to 5 GPa) have been performed on BaFe2(As1−xPx)2 single crystals with x = 0 and 0.20 between ∼ 85 - 7000 cm−1 down to 6 K. Normal state charge dynamics as well as the low temperature dynamics (magnetically ordered (SDW) state and superconducting (SC) state) under pressure have been investigated. At temperatures above the magnetic phase transition, the metallicity of the system is increasing with pressure. At lower temperatures, with increasing pressure the partial suppression of the SDW state and the appearance of the SC state (at around 3.6 GPa) is observed for the parent compound with x=0. The coexisting of these two states has been clearly demonstrated. The results of this study indicate a possible competing order scenario for these two orders. On the other hand, for the compound with x=0.20, the SDW state has been completely suppressed above 2.5 GPa. The normal state and the superconducting state in this compound will be discussed in comparison to the parent compound.