Bulk evidence for single-gap s-wave superconductivity in the intercalated graphite superconductor C${}_6$Yb

Abstract

We report measurements of the in-plane electrical resistivity $\rho$ and the thermal conductivity $\kappa$ of the intercalated graphite superconductor C${}_6$Yb to temperatures as low as $T_c$/100. When a field is applied along the c-axis, the residual electronic linear term ${\kappa }_0/T$ evolves in an exponential manner for $H_{c1}<H<H_{c2}$. This activated behaviour establishes the order parameter as unambiguously s-wave, and rules out the possibility of multi-gap or unconventional superconductivity in this system.

4 pages, 4 figs, submitted to Phys. Rev. Lett

References in corpus (14)

• Superconductivity in diamond
• Superconductivity in the Intercalated Graphite Compounds C6Yb and C6Ca
• Superconductivity of bulk CaC6
• Electronic structure of superconducting graphite intercalate compounds: The role of the interlayer state
• Impurity-Induced Quasiparticle Transport and Universal Limit Wiedemann-Franz Violation in d-Wave Superconductors
• Electronic thermal conductivity and the Wiedemann-Franz law for unconventional superconductors
• Heat Transport in a Strongly Overdoped Cuprate: Fermi Liquid and Pure d-wave BCS Superconductor
• Metal-Insulator-Like Behavior in Semimetallic Bismuth and Graphite
• Thermal conductivity of single crystalline MgB_2
• Intercalant-Driven Superconductivity in YbC${}_6$ and CaC${}_6$
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• Universal Magnetic-Field-Driven Metal-Insulator-Metal Transformations in Graphite and Bismuth
• Experimental evidence of s-wave superconductivity in bulk CaC${}_6$
• Electronic Thermal Conductivity of Multi-Gap Superconductors with Application to MgB_2

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• Low-temperature phonon thermal conductivity of cuprate single crystals
• Superconductivity in graphite intercalation compounds
• Low-temperature magneto-thermal transport investigation of a Ni-based superconductor BaNi2As2: Evidence for fully gapped superconductivity
• Non-adiabatic phonons within the doped graphene layers of XC${}_6$ compounds
• Unresolved problems in superconductivity of CaC6
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Neutron scattering study of the high energy graphitic phonons in superconducting CaC${}_6$
• Thermal conductivity in a mixed state of a superconductor at low magnetic fields
• Anisotropic superconductivity in graphite intercalation compound YbC6