Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Superconductivity: Fe-based Superconductors - 122

TT 27.5: Vortrag

Dienstag, 12. März 2013, 10:45–11:00, H18

Thermopower as sensitive probe of electronic nematicity in iron pnictides — Shuai Jiang^1,2, H.S. Jeevan¹, Jinkui Dong¹, and •Philipp Gegenwart¹ — ¹I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — ²1.Physikalisches Institut, Universität Stuttgart, Germany

We study the in-plane anisotropy of the thermoelectric power and electrical resistivity on detwinned single crystals of isovalent substituted EuFe₂(As_1−xP_x)₂. Compared to the resistivity anisotropy the thermopower anisotropy is more pronounced and clearly visible already at temperatures much above the structural and magnetic phase transitions. Most remarkably, the thermopower anisotropy changes sign below the structural transition. This is associated with the interplay of two contributions due to anisotropic scattering and orbital polarization, which dominate at high- and low-temperatures, respectively.
[1] S. Jiang, H. S. Jeevan, J. Dong, P. Gegenwart, arXiv:1210.2634