Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-16
Supercond. Sci. Technol. 24 (2011) 065010
Physics
Condensed Matter
Superconductivity
6 two-column pages, 6 figs., 26 Refs., to be published in Superconductor Science and Technology
Scientific paper
10.1088/0953-2048/24/6/065010
Point-contact (PC) Andreev-reflection (AR) measurements of the superconducting gap in iron-oxipnictide ReFeAsO_{1-x}F_x (Re=La, Sm) films have been carried out. The value of the gap is distributed in the range 2\Delta \simeq 5-10 meV (for Re=Sm) with a maximum in the distribution around 6 meV. Temperature dependence of the gap \Delta(T) can be fitted well by BCS curve giving reduced gap ratio 2\Delta /kT_c^*\simeq 3.5 (here T_c^* is the critical temperature from the BCS fit). At the same time, an expected second larger gap feature was difficult to resolve distinctly on the AR spectra making determination reliability of the second gap detection questionable. Possible reasons for this and the origin of other features like clear-cut asymmetry in the AR spectra and current regime in PCs are discussed.
Fuchs Guenter
Haindl Silvia
Holzapfel Bernhard
Kidszun Martin
Kvitnitskaya O. E.
No associations
LandOfFree
Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-263050