Specific-Heat Evidence for Two-Gap Superconductivity in the Ternary-Iron Silicide Lu2Fe3Si5
Y. Nakajima, T. Nakagawa, T. Tamegai, H. Harima
DOI 10.1103/PhysRevLett.100.157001 · Physical Review Letters
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Abstract
We report low-temperature specific-heat studies on the single-crystalline ternary-iron silicide superconductor Lu2Fe3Si5 with Tc=6.1 K down to ∼Tc/20. We confirm a reduced normalized jump in specific heat at Tc, and find that the specific heat divided by temperature C/T shows a sudden drop at ∼Tc/5 and goes to zero with further decreasing temperature. These results indicate the presence of two distinct superconducting gaps in Lu2Fe3Si5, similar to the typical two-gap superconductor MgB2. We also report Hall coefficients, band structure calculations, and the anisotropy of upper critical fields for Lu2Fe3Si5, which support the anisotropic multiband nature and reinforce the existence of two superconducting gaps in Lu2Fe3Si5.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Lu2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | onset |
| Lu2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | onset |
| Sc2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
| Y2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tm2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Er2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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