Probing the superconducting gap symmetry of PrRu4Sb12: A comparison with PrOs4Sb12

Elbert E. M. Chia; M. B. Salamon; H. Sugawara; H. Sato

doi:10.1103/PhysRevB.69.180509

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Probing the superconducting gap symmetry of PrRu4Sb12: A comparison with PrOs4Sb12

Elbert E. M. Chia, M. B. Salamon, H. Sugawara, H. Sato

DOI 10.1103/PhysRevB.69.180509 · Physical Review B

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Abstract

We report measurements of the magnetic penetration depth λ in single crystals of PrRu4Sb12 down to 0.1 K. Both λ and superfluid density ρs exhibit an exponential behavior for T<0.5Tc, with parameters Δ(0)/kBTc=1.9 and λ(0)=2900Å. The value of Δ(0) is consistent with the specific-heat jump value of ΔC/γTc=1.87 measured elsewhere, while the value of λ(0) is consistent with the measured value of the electronic heat-capacity coefficient γ. Our data are consistent with PrRu4Sb12 being a moderate-coupling, fully gapped superconductor. We suggest experiments to study how the nature of the superconducting state evolves with increasing Ru substitution for Os.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrRu4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.25	Pressure not reported	midpoint
PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown