| Autor: |
Yung-Yuan Hsu, Yu-Bo Li, Shou-Ting Jian, Gu-Kuei Li, Ming-Cheng Yang |
| Předmět: |
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| Zdroj: |
Superconductor Science & Technology; Mar2016, Vol. 29 Issue 3, p1-1, 1p |
| Abstrakt: |
Superconducting properties were studied on high quality superconductors (Tc = 39 K) and (Tc = 44 K) prepared by intercalating Ba/Sr atoms into tetragonal β-FeSe by liquid ammonia. The elongated c-axis and almost unchanged a-axis of , compared with β-FeSe, suggests an unchanged intra--layer structure and the Tc enhancement is due to a 3D to 2D-like Fermi surface transformation. The superconducting coherent lengths ξ(0), the Ginzburg–Landau parameters κ and penetration depths λ(0) obtained from the extrapolated lower and upper critical fields Bc1(0) and Bc2(0) indicate that both compounds are typical type-II superconductors. The temperature dependence of 1/(T) of deduced from the low-field magnetic susceptibility shows a two-gap s-wave behavior with superconducting gaps of = 6.47 meV and = 1.06 meV. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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