Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-11
Physics
Condensed Matter
Superconductivity
Scientific paper
The effect of atomic disorder induced by neutron irradiation on the crystal structure and electronic states near $E_F$ of the lightly overdoped LaFeAsO$_{0.85}$F$_{0.15}$ ($T_c=21K$) was studied by X-ray diffraction and $^{75}$As NMR. The irradiation of the polycrystalline sample by "moderate" neutron fluence of $\Phi=(0;0.5;1.6)\cdot10^{19}cm^{-2}$ at $T=50^{\circ}C$ leads to the suppression of superconductivity. It is shown that neutron irradiation produces an anisotropic expansion of the tetragonal lattice almost due to an increase of the Fe-As distance. A partial loss of the 2D character of the FeAs layer is accompanied with a suppression of the gap-like feature in temperature dependence of the spin susceptibility. In the most disordered state the $^{75}$As spin-lattice relaxation rate follows the Korringa law $^{75}T_1^{-1} \sim T$, the thermal behavior being typical for an isotropic motion of the conducting electrons.
Behr Günter
Gerashenko A.
Goshchitskii B.
Karkin A.
Kazantsev Alexandr
No associations
LandOfFree
Structural and electronic properties of LaFeAsO$_{0.85}$F$_{0.15}$ superconductor modified under neutron irradiation 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 Structural and electronic properties of LaFeAsO$_{0.85}$F$_{0.15}$ superconductor modified under neutron irradiation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structural and electronic properties of LaFeAsO$_{0.85}$F$_{0.15}$ superconductor modified under neutron irradiation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-533678