Details

Autor(en) / Beteiligte

• Kidszun, M
• Haindl, S
• Thersleff, T
• Hänisch, J
• Kauffmann, A
• Iida, K
• Freudenberger, J
• Schultz, L
• Holzapfel, B

Titel

Critical current scaling and anisotropy in oxypnictide superconductors

Ist Teil von

• Physical review letters, 2011-03, Vol.106 (13), p.137001-137001, Article 137001

Ort / Verlag

United States

Erscheinungsjahr

2011

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Having succeeded in the fabrication of epitaxial superconducting LaFeAsO(1-x)F(x) thin films we performed an extensive study of electrical transport properties. In the face of multiband superconductivity we can demonstrate that an anisotropic Ginzburg-Landau scaling of the angular dependent critical current densities can be adopted, although being originally developed for single band superconductors. In contrast with single band superconductors the mass anisotropy of LaFeAsO(1-x)F(x) is temperature dependent. A very steep increase of the upper critical field and the irreversibility field can be observed at temperatures below 6 K, indicating that the band with the smaller gap is in the dirty limit. This temperature dependence can be theoretically described by two dominating bands responsible for superconductivity. A pinning force scaling provides insight into the prevalent pinning mechanism and can be specified in terms of the Kramer model.