✦ LIBER ✦
Specific heat study of ternary iron-silicide superconductor Lu2Fe3Si5: Evidence for two-gap superconductivity
✍ Scribed by Y. Nakajima; G.J. Li; T. Tamegai
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 257 KB
- Volume
- 468
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
We report the low temperature specific heat of ternary iron-silicide superconductor Lu 2 Fe 3 Si 5 with T c = 6 K down to $T c /20. We find that a normalized specific heat jump at T c , DC/c n T c , is smaller than BCS value of 1.43. We also find that the specific heat divided by temperature C/T shows a sudden drop at $T c /5 and goes to zero with further decreasing temperature. These results strongly indicate the presence of two distinct superconducting gaps in Lu 2 Fe 3 Si 5 and can be well described by the phenomenological two-gap model similar to typical two-gap superconductor MgB 2 .