Evolution of superconducting order in Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$

Abstract

We report measurements of the magnetic penetration depth $\lambda$ in single crystals of Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$ down to 0.1 K. Both $\lambda$ and superfluid density ${\rho }_s$ exhibit an exponential behavior for the $x$$\ge$0.4 samples, going from weak ($x$=0.4,0.6), to moderate, coupling ($x$=0.8). For the $x$$\le$0.2 samples, both $\lambda$ and ${\rho }_s$ vary as $T^2$ at low temperatures, but ${\rho }_s$ is s-wave-like at intermediate to high temperatures. Our data are consistent with a three-phase scenario, where a fully-gapped phase at $T_{c1}$ undergoes two transitions: first to an unconventional phase at $T_{c2}$$\lesssim$$T_{c1}$, then to a nodal low-$T$ phase at $T_{c3}$$<$$T_{c2}$, for small values of $x$.

arXiv commentChanged title, enlarged numbering in figures 5 pages, 4 figures, 1 table

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Cited by in corpus (6)

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• Probing the superconducting gap symmetry of $\alpha$-PdBi${}_2$: A penetration depth study
• Dimensional crossover in the quasi-one-dimensional superconductor Tl${}_2$Mo${}_6$Se${}_6$
• Multiband superconductivity in the correlated electron filled skutterudite system Pr(1-x)Ce(x)Pt4Ge12
• Penetration depth study of LaOs${}_4$Sb${}_{12}$: Multiband s-wave superconductivity