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.

6 pages, 4 figures, 1 table

References in corpus (8)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe${}_2$As${}_2$ single crystals
• Quasiparticle Heat Transport in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: Evidence for a k-dependent Superconducting Gap without Nodes
• Resistivity and upper critical field in KFe${}_2$As${}_2$ single crystals
• Specific heat in KFe2As2 in zero and applied magnetic field
• Superfluid density and superconducting gaps of RbFe_{2}As_{2} as a function of hydrostatic pressure

Cited by in corpus (5)

• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
• Universal V-shaped temperature-pressure phase diagram in the iron-based superconductors KFe2As2, RbFe2As2, and CsFe2As2
• Spectroscopic studies of the superconducting gap in the 12442 family of iron-based compounds
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor