Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides Ln FeAsO1-y (Ln: La and Nd) with the highest Tc's among known Fe-based superconductors. The effect of "doping" in this system is mainly on the carrier scattering, quite distinct from that in high- Tc cuprates. In the superconducting regime of the La system with maximum Tc =28 K, the low-temperature resistivity is dominated by a T2 term. On the other hand, in the Nd system with Tc higher than 40 K, the carriers are subject to stronger scattering showing T -linear resistivity and small magnetoresistance. Such strong scattering appears crucial for high- Tc superconductivity in the iron-based system.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2010 Mar 16|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics