Thermoelectric Power of RO$_{1-x-y}$F$_{x}$FeAs

ORAL

Abstract

The thermoelectric power $S$($T$) has been measured on the RO$_ {1-x-y}$F$_{x}$FeAs samples with $0 \leq x \leq 0.3$ and $0 \leq y \leq 0.5$ and with the rare earth R = La, Ce, Sm and Pr. Together with Hall and lattice parameter studies, systematical $x$-dependency is observed, although rather weak for samples with $x > 0$ and $y = 0$. The $S$($T$) of the undoped samples with $x = y = 0$, however, appears to have rather different shape and amplitude. By comparing with the resistivity drop around 150 K, the change seems to be associated with the spin/lattice instability previously proposed.

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Authors

  • Kalyan Sasmal

  • Melissa Gooch

  • Fengyan Wei

    • Texas Center for Superconductivity at University of Houston and Department of Physics

  • Bernd Lorenz

    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204-5002, USA
    • TCSUH and Dept. of Physics, University of Houston
    • Texas Center for Superconductivity at the University of Houston and Department of Physics
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA

  • Yu-Yi Xue

    • University of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA

  • Feng Chen

    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA

  • Ching-Wu Chu

    • University of Houston
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204-5002, USA
    • Dept. of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002
    • Texas Center for Superconductivity at the University of Houston; Lawrence Berkeley National Laboratory; Hong Kong University of Science and Technology
    • TCSUH and Department of Physics, University of Houston, Houston, Texas 77204, USA;

  • Bing Lv

    • Texas Center for Superconductivity at the University of Houston and Department of Chemistry
    • TCSUH and Department of Chemistry, University of Houston, Houston, Texas 77204, USA

  • Zhongjia Tang

  • Arnold M. Guloy

    • Dept. of Chemistry, University of Houston, Houston, TX 77204
    • Texas Center for Superconductivity at the University of Houston and Department of Chemistry
    • TCSUH and Department of Chemistry, University of Houston, Houston, Texas 77204, USA