Fig. 3
From: Optical anisotropy in optimally doped iron-based superconductor
Temperature dependence of the anisotropic optical response of Ba0.6K0.4Fe2As2 upon applying stress: a T dependence of the quantity ΔRRatio(ω0) (see text) within the p-loop experiment after a ZPC protocol, which emphasizes the T evolution of the p-induced optical anisotropy. We choose ω0 = 600 cm−1. b Measured σ1(ω) at 10 K and 60 K for p = 1.2 bar along both crystallographic axes. c–e T dependence of Δσ1(ω) at the selected p of 0, 1.2 and released 0 bar. These panels focus the attention to the FIR energy interval 200–1000 cm−1, thus emphasising the reversible optical anisotropy upon sweeping p. The thick dashed line in all panels indicates Tc. A first-neighbor interpolation procedure is used in order to generate the color maps. Released pressures are denoted by ‘(r)’
