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

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arxiv 1202.3589 v1 pith:LJ5IUX64 submitted 2012-02-16 cond-mat.supr-con cond-mat.str-el

J. J. Ying , J. C. Liang , X. G. Luo , X. F. Wang , Y. J. Yan , M. Zhang , A. F. Wang , Z. J. Xiang
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G. J. Ye P. Cheng X. H. Chen
This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords anisotropydopingin-planepropertiesresistivitysuperconductorstransportalthough
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abstract

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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