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- W3100303542 abstract "We performed systematic thermal conductivity measurements on heavily hole-doped Ba$_{1-x}$K$_x$Fe$_2$As$_2$ single crystals with 0.747 $leq x leq$ 0.974. At $x$ = 0.747, the $kappa_0/T$ is negligible, indicating nodeless superconducting gap. A small residual linear term $kappa_0/T$ ($approx$ 0.035 mW/K$^2$ cm) appears at $x$ = 0.826, and it increases slowly up to $x$ = 0.974, followed by a drastic increase of more than 20 times to the pure KFe$_2$As$_2$ ($x$ = 1.0). This doping dependence of $kappa_0/T$ clearly shows that the nodal gap appears near $x = 0.8$, likely associated with the change of Fermi surface topology. The small values of $kappa_0/T$ from $x$ = 0.826 to 0.974 support a $curlyvee$-shaped nodal $s$-wave gap recently revealed by angle-resolved photoemission spectroscopy experiments at $x$ = 0.9. Furthermore, the drastic increase of $kappa_0/T$ from $x$ = 0.974 to 1.0 is inconsistent with a symmetry-imposed $d$-wave gap in KFe$_2$As$_2$, and the possible nodal gap structure in KFe$_2$As$_2$ is discussed." @default.
- W3100303542 created "2020-11-23" @default.
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- W3100303542 date "2015-12-01" @default.
- W3100303542 modified "2023-09-30" @default.
- W3100303542 title "Doping Evolution of the Superconducting Gap Structure in Heavily Hole-Doped Ba <sub> 1− <i>x</i> </sub> K <sub> <i>x</i> </sub> Fe <sub>2</sub> As <sub>2</sub> : a Heat Transport Study" @default.
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- W3100303542 doi "https://doi.org/10.1088/0256-307x/32/12/127403" @default.
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