Penetration depth study of LaOs${}_4$Sb${}_{12}$: Multiband s-wave superconductivity

Abstract

We measured the magnetic penetration depth $\lambda (T)$ in single crystals of LaOs${}_4$Sb${}_{12}$ ($T_c$=0.74 K) down to 85 mK using a tunnel diode oscillator technique. The observed low-temperature exponential dependence indicates a s-wave gap. Fitting the low temperature data to BCS s-wave expression gives the zero temperature gap value $\Delta (0)=(1.34\pm 0.07)k_B{T}_c$ which is significantly smaller than the BCS value of 1.76$k_B{T}_c$. In addition, the normalized superfluid density $\rho (T)$ shows an unusually long suppression near $T_c$, and are best fit by a two-band s-wave model.

5 pages, 2 figures

References in corpus (4)

• Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs${}_4$Sb${}_{12}$
• Superfluid response in electron-doped cuprate superconductors
• Transport properties of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Eliashberg theory of superconductivity and inelastic rare-earth impurity scattering in filled skutterudite La${}_{1-x}$Pr${}_x$Os${}_4$Sb${}_{12}$

Cited by in corpus (4)

• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Recent progress on superconductors with time-reversal symmetry breaking
• Multiband superconductivity in PrPt4Ge12 single crystals
• Superfluid response in heavy fermion superconductors