1202.3589 (J. J. Ying et al.)

Transport and magnetic properties of La-doped CaFe$_2$As$_2$    [PDF]

J. J. Ying, J. C. Liang, X. G. Luo, X. F. Wang, Y. J. Yan, M. Zhang, A. F. Wang, Z. J. Xiang, G. J. Ye, P. Cheng, X. H. Chen

We measured the transport properties and susceptibility of single crystals
Ca$_{1-x}$La$_x$Fe$_2$As$_2$(x=0, 0.05, 0.1, 0.15, 0.19 and 0.25). Large
in-plane resistivity anisotropy similar to that in Co-doped 122 iron-pnictides
is observed although no transition metals were introduced in the FeAs-plane.
The in-plane resistivity anisotropy gradually increases with La doping below
T$_{SDW}$, being different from the hole-doped 122 superconductors. The
susceptibilities of the samples show that La doping leads to suppression of SDW
and induces a Curie-Weiss-like behavior at low temperature, which is much
stronger than the other 122 iron-based superconductors.

View original: http://arxiv.org/abs/1202.3589