Transport and magnetic properties of La-doped CaFe$_2$As$_2$
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
TL;DR
This study investigates how La doping affects the transport and magnetic properties of CaFe$_2$As$_2$, revealing increased resistivity anisotropy and suppressed SDW order, with notable magnetic behavior changes.
Contribution
It provides new insights into La doping effects on CaFe$_2$As$_2$, highlighting anisotropy and magnetic suppression without transition metal substitution.
Findings
Resistivity anisotropy increases with La doping.
La doping suppresses SDW order.
Strong Curie-Weiss-like magnetic behavior emerges.
Abstract
We measured the transport properties and susceptibility of single crystals CaLaFeAs(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, 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.
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