Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO

Kim, J.; Fujiwara, A.; Sawada, T.; Kim, Y.; Sugimoto, K.; Kato, K.; Tanaka, H.; Ishikado, M.; Shamoto, S.; Takata, M.

doi:10.1107/S2052252514005636

Figure 2
Electrostatic potential map with equipotential lines (a)–(c), variation of the electrostatic potential volume (V_EP^Fe) of the Fe atom (e) and asymmetric ratio (P₁/P₂) of electrostatic potential distribution around the As ion (f) as a function of F-content (x) at 19.5 K. T_c are plotted in (g). The dashed curve around Fe in (a)–(c) is the trace of the local minimum points of electrostatic potential around the Fe atom. The minimum points, P₁ (P₂), of electrostatic potential distribution around the As ion are shown in (d) which is the one-dimensional plot of the dashed line crossing the center position of the La and the As ion. T_c^onset and T_c^s in (g) are defined by the onset temperatures of the Meissner signals and the temperatures of the structural phase transition from a tetragonal phase to an orthorhombic phase.

IUCrJ

Volume 1| Part 3| April 2014| Pages 155-159

ISSN: 2052-2525

doi:10.1107/S2052252514005636

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