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29 March 2024
 
  » arxiv » 1307.3408

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Superconducting gap with sign reversal between hole pockets in heavily hole-doped Ba1-xKxFe2As2
D. Watanabe ; T. Yamashita ; Y. Kawamoto ; S. Kurata ; Y. Mizukami ; T. Ohta ; S. Kasahara ; M. Yamashita ; T. Saito ; H. Fukazawa ; Y. Kohori ; S. Ishida ; K. Kihou ; C. H. Lee ; A. Iyo ; H. Eisaki ; A. B. Vorontsov ; T. Shibauchi ; Y. Matsuda ;
Date 12 Jul 2013
AbstractTo gain insight into the unconventional superconductivity of Fe-pnictides with no electron pockets, we measure the thermal conductivity $kappa$ and penetration depth $lambda$ in the heavily hole-doped regime of Ba$_{1-x}$K$_x$Fe$_2$As$_2$. The residual thermal conductivity $(kappa/T)_{T ightarrow 0,{ m K}}$ and $T$-dependence of $lambda$ consistently indicate the fully gapped superconductivity at $x=0.76$ and the (line) nodal superconductivity at higher hole concentrations. The magnitudes of $frac{kappa}{T}cdot T_c|_{T ightarrow 0,{ m K}}$ and $frac{dlambda}{d(T/T_c)}$ at low temperatures, both of which are determined by the properties of the low-energy excitations, exhibit a highly unusual non-monotonic x-dependence. These results indicate a dramatic change of the nodal characteristics in a narrow doping range, suggesting a doping crossover of the gap function between the s-wave states with and without sign reversal between $Gamma$-centered hole pockets.
Source arXiv, 1307.3408
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