Superconducting parameters of BaPt4−xAuxGe12 filled skutterudite
A. Maisuradze, R. Gumeniuk, W. Schnelle, M. Nicklas, C. Baines, R. Khasanov, A. Amato, A. Leithe-Jasper
DOI 10.1103/PhysRevB.86.174513 · Physical Review B
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Abstract
We report on a study of the superconducting properties for a series of polycrystalline BaPt4−xAuxGe12 filled skutterudite compounds for x=0, 0.5, 0.75, and 1. Muon spin rotation (μSR) spectroscopy as well as magnetization, specific-heat, and electrical resistivity measurements were performed. The magnetic penetration depth λ, the coherence length ξ, and the Ginzburg-Landau parameter κ are evaluated. The temperature dependence of the superfluid density is well described by an s-wave superconducting gap and this classical scenario is supported by the field-independent λ. The gap-to-Tc ratio Δ0/kBTc increases with the Au content from 1.70 for x=0 to 2.1(1) for x=1. By combining μSR, magnetization, and specific-heat data, we find that BaPt4−xAuxGe12 compounds are in between the dirty and clean limits with mean free paths of the carriers l∼ξ. Interestingly, resistivity data for BaPt4Ge12 indicate a much higher upper critical field, which is probably due to defects or impurities close to the surface of the crystallites.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.9 | Pressure not reported | onset |
| BaPt3.5Au0.5Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure not reported | onset |
| BaPt3.25Au0.75Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.25 | Pressure not reported | onset |
| BaPt3AuGe12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.95 | Pressure not reported | onset |
| BaPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.9 | Pressure not reported | unknown |
| BaPt3.5Au0.5Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure not reported | unknown |
| BaPt3.25Au0.75Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.25 | Pressure not reported | unknown |
| BaPt3AuGe12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.95 | Pressure not reported | unknown |
| SrPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
| ThPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.62 | Pressure not reported | unknown |
| LaPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | Pressure not reported | unknown |
| PrPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | unknown |
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