Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap

Abstract

The in-plane thermal conductivity of iron-based superconductor RbFe${}_2$As${}_2$ single crystal ($T_c\approx$ 2.1 K) was measured down to 100 mK. In zero field, the observation of a significant residual linear term ${\kappa }_0/T$ = 0.65 mW K${}^{-2}$ cm${}^{-1}$ provides clear evidence for nodal superdonducting gap. The field dependence of ${\kappa }_0/T$ is similar to that of its sister compound CsFe${}_2$As${}_2$ with comparable residual resistivity ${\rho }_0$, and lies between the dirty and clean KFe${}_2$As${}_2$. These results suggest that the (K,Rb,Cs)Fe${}_2$As${}_2$ serial superconductors have a common nodal gap structure.

arXiv comment6 pages, 4 figures, 1 table

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• Evolution of quasiparticle excitations with critical mass enhancement in superconducting AFe2As2 (A = K, Rb, and Cs)
• Increasing stripe-type fluctuations in $A$Fe${}_2$As${}_2$ ($A$ = K, Rb, Cs) superconductors probed by ${}^{75}$As NMR spectroscopy
• Doping evolution of the superconducting gap structure in heavily hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: heat transport study
• Constraints on the total coupling strength to bosons in iron based superconductors
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• Possible superconducting fluctuation and pseudogap state above $T_c$ in CsFe${}_2$As${}_2$
• Vortex lattice and vortex bound states in CsFe${}_2$As${}_2$ investigated by scanning tunneling microscopy/spectroscopy
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• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
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