| Autor: |
Abdel-Hafiez, M, Ge, Junyi, Vasiliev, AN, Chareev, DA, Van de Vondel, Joris, Moshchalkov, Victor, Silhanek, AV |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
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| Popis: |
We investigate the temperature dependence of the lower critical field Hc1(T ) of a high-quality FeSe single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the first vortex penetration field has been experimentally obtained by two independent methods and the corresponding Hc1(T ) was deduced by taking into account demagnetization factors. A pronounced change in the Hc1(T) curvature is observed, which is attributed to anisotopic s-wave or multiband superconductivity. The London penetration depth λab(T ) calculated from the lower critical field does not follow an exponential behavior at low temperatures, as it would be expected for a fully gapped clean s-wave superconductor. Using either a two-band model with s-wave-like gaps of magnitudes 1 = 0.41 ± 0.1 meV and 2 = 3.33 ± 0.25 meV or a single anisotropic s-wave order parameter, the temperature dependence of the lower critical field Hc1(T ) can be well described. These observations clearly show that the superconducting energy gap in FeSe is nodeless. 7 pages, 5 figures ispartof: Physical Review B, Condensed Matter and Materials Physics vol:88 issue:17 status: published |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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