Physics – Condensed Matter – Superconductivity
Scientific paper
2010-05-21
J. Low. Temp. Phys. 162 (2011) pp. 40-51
Physics
Condensed Matter
Superconductivity
12 pages, 6 embedded figures, submitted for publication in Supercond. Sci. Technol
Scientific paper
10.1016/j.physc.2010.11.006
The AC susceptibility at zero DC magnetic field of a polycrystalline sample of LaFeAsO_{0.94}F_{0.06} (T_c = 24 K) has been investigated as a function of the temperature, the amplitude of the AC magnetic field (in the range Hac = 0.003 - 4 Oe) and the frequency (in the range f = 10 kHz - 100 kHz). The temperature dependence of the AC susceptibility exhibits the typical two-step transition arising from the combined response of superconduncting grains and intergranular weak-coupled medium. The intergranular part of the susceptibility strongly depends on both the amplitude and the frequency of the AC driving field, from few Kelvin below T_c down to T = 4.2 K. Our results show that, in the investigated sample, the intergrain critical current is not determined by pinning of Josephson vortices but by Josephson critical current across neighboring grains.
Bonsignore G.
Chen Guo-Feng
Li Vigni Agliolo Gallitto M. A.
Luo Jian-Lin
Shovkun D. V.
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