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

Details Transport and magnetic properties of La-doped CaFe$_2$As$_2$ Transport and magnetic properties of La-doped CaFe$_2$As$_2$

2012-02-16

arxiv.org/abs/1202.3589v1

Phys. Rev. B 85, 144514 (2012)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.85.144514

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.

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