Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-19
EPL 87, 37001 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1209/0295-5075/87/37001
In Ba(Fe0.95Co0.05)2As2 all of the 75As NMR intensity at the paramagnetic resonance position vanishes abruptly below Tonset(SDW)=56 K, indicating that magnetic (spin density wave) order is present in all of the sample volume, despite bulk superconductivity below Tc=15 K. The two phases thus coexist homogeneously at the microscopic scale. In Ba0.6K0.4Fe2As2, on the other hand, the signal loss below Tonset(SDW)~75 K is not complete, revealing that magnetic order is bound to finite-size areas of the sample, while the remaining NMR signal shows a clear superconducting response below Tc=37 K. Thus, the two phases are not homogeneously mixed, at least for this potassium concentration. For both samples, spatial electronic and/or magnetic inhomogeneity is shown to characterize the NMR properties in the normal state.
Berthier Claude
Chen Guo-Feng
Horvatic Mladen
Julien M.-H.
Luo Jian-Lin
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