Penetration depth study of LaOs4Sb12: Multiband s-wave superconductivity

X. Y. Tee; H. G. Luo; T. Xiang; D. Vandervelde; M. B. Salamon; H. Sugawara; H. Sato; C. Panagopoulos; Elbert E. M. Chia

doi:10.1103/PhysRevB.86.064518

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Penetration depth study of LaOs4Sb12: Multiband s-wave superconductivity

X. Y. Tee, H. G. Luo, T. Xiang, D. Vandervelde, M. B. Salamon, H. Sugawara, H. Sato, C. Panagopoulos, Elbert E. M. Chia

DOI 10.1103/PhysRevB.86.064518 · Physical Review B

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Abstract

We measured the magnetic penetration depth λ(T) in single crystals of LaOs4Sb12 (Tc=0.74 K) down to 85 mK using a tunnel-diode-oscillator technique. The observed low-temperature exponential dependence indicates an s-wave gap. Fitting the low-temperature data to a BCS s-wave expression gives the zero-temperature gap value Δ(0)=(1.34±0.07)kBTc which is significantly smaller than the BCS value of 1.76kBTc. In addition, the normalized superfluid density ρ(T) shows an unusually long suppression near Tc and is best fit by a two-band s-wave model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.74	Pressure not reported	unknown
LaOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.68	Pressure not reported	midpoint
PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.85	Pressure not reported	unknown