Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOs${}_4$Sb${}_{12}$

Abstract

Transverse-field muon spin rotation ($\mu$SR) experiments in the heavy-fermion superconductor PrOs${}_4$Sb${}_{12}$ ($T_c=1.85$ K) suggest that the superconducting penetration depth $\lambda (T)$ is temperature-independent at low temperatures, consistent with a gapped quasiparticle excitation spectrum. In contrast, radiofrequency (rf) inductive measurements yield a stronger temperature dependence of $\lambda (T)$, indicative of point nodes in the gap. This discrepancy appears to be related to the multiband structure of PrOs${}_4$Sb${}_{12}$. Muon Knight shift measurements in PrOs${}_4$Sb${}_{12}$ suggest that the perturbing effect of the muon charge on the neighboring Pr${}^{3+}$ crystalline electric field is negligibly small, and therefore is unlikely to cause the difference between the $\mu$SR and rf results.

arXiv comment10 pages, 7 figures

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• Weak Interband-Coupling Superconductivity in the Filled Skutterudite LaPt4Ge12
• Three-Dimensional Majorana Fermions in Chiral Superconductors
• Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)_4Sb_12 and (Pr,La)Os_4Sb_12
• Multiband superconductivity in PrPt4Ge12 single crystals
• Probing the superconductivity of PrPt4Ge12 through Ce substitution
• Broken Time Reversal Symmetry in Superconducting Pr1-xCexPt4Ge12
• Broken time-reversal symmetry in superconducting Pr${}_{1-x}$La${}_x$Pt${}_4$Ge${}_{12}$
• Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt${}_4$Ge${}_{12-x}$Sb${}_x$
• Muon spin rotation and relaxation in Pr${}_{1-x}$Nd${}_x$Os${}_4$Sb${}_{12}$: Magnetic and superconducting ground states
• Muon spin rotation and relaxation in Pr${}_{1-x}$Nd${}_x$Os${}_4$Sb${}_{12}$: Paramagnetic states
• Superfluid response in heavy fermion superconductors