Two-gap superconductivity seen in penetration-depth measurements of Lu2Fe3Si5 single crystals
R. T. Gordon, M. D. Vannette, C. Martin, Y. Nakajima, T. Tamegai, R. Prozorov
DOI 10.1103/PhysRevB.78.024514 · Physical Review B
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Abstract
A single crystal of superconducting Lu2Fe3Si5 was studied using the tunnel-diode resonator technique in the Meissner and mixed states. The temperature dependence of the superfluid density provides strong evidence for two-gap superconductivity and indicates that there are nearly equal contributions from each gap having magnitudes of Δ1/kBTc=1.86 and Δ2/kBTc=0.54. In the vortex state, the pinning strength shows unusually strong temperature dependence and is nonmonotonic with the magnetic field (peak effect). The irreversibility line is sharply defined and quite distant from the Hc2(T) line, which hints at enhanced vortex fluctuations in this two-gap system. Altogether, our findings from electromagnetic measurements provide strong support for the existence of two-gap superconductivity in Lu2Fe3Si5, as previously suggested from specific-heat measurements.
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 | Pressure not reported | unknown |
| Y2Fe3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | Pressure not reported | unknown |
| 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 |
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