Evolution of the superconducting energy gap structure concomitant with Fermi surface reconstruction in the heavy-fermion superconductor CeCoIn5

Abstract

The London penetration depth, $\lambda (T)$ was measured in single crystals of Ce${}_{1-x}{R}_x$CoIn${}_5$, $R$=La, Nd and Yb down to 50~mK ($T_c/T\sim$50) using a tunnel-diode resonator. In the cleanest samples $\Delta \lambda (T)$ is best described by the power law, $\Delta \lambda (T)\propto T^n$, with $n\sim 1$, consistent with line nodes. Substitutions of Ce with La, Nd and Yb lead to similar monotonic suppressions of $T_c$, however the effects on $\Delta \lambda (T)$ differ. While La and Nd doping results in an increase of the exponent to $n\sim 2$, as expected for a dirty nodal superconductor, Yb doping leads to $n>3$, inconsistent with nodes, suggesting a change from nodal to nodeless superconductivity where Fermi surface topology changes were reported, implying that the nodal structure and Fermi surface topology are closely linked.

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• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials
• Evidence for s-wave Pairing with Atomic Scale Disorder in the van der Waals Superconductor NaSn2As2
• Molecular Pairing and Fully-Gapped Superconductivity in Yb doped CeCoIn5
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Topological Phase Transitions in Line-nodal Superconductors
• Campbell penetration depth in low carrier density superconductor YPtBi
• Direct observation of heavy quasiparticles in the Kondo lattice CeIn3
• Spectroscopic Evidence for the Direct Involvement of Local Moments in the Pairing Process of the Heavy-Fermion Superconductor CeCoIn${}_5$
• Evolution of Magnetic Order from the Localized to the Itinerant Limit
• Differential Conductance and Defect States in the Heavy Fermion Superconductor CeCoIn${}_5$
• Universal Heat Conduction in Ce1-xYbxCoIn5: Evidence for Robust Nodal d-wave Superconducting Gap
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• Floquet engineering multi-channel Kondo physics
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• Superfluid response in heavy fermion superconductors
• Pressure studies of the quantum critical alloy Ce(0.93)Yb(0.07)CoIn5
• Microscopic Insights into London Penetration Depth: Application to CeCoIn${}_5^{}$
• Magnetic Quantum Criticality inside the Superconducting State Revealed by Penetration Depth Scaling with Local $T_{\mathrm{c}}$