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Synthesis and physical properties of Ca1-xRExFeAs2 with RE = La ~ Gd

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arxiv 1404.2738 v1 pith:O7CH3RBJ submitted 2014-04-10 cond-mat.supr-con

Alberto Sala , Hiroyuki Yakita , Hiraku Ogino , Tomoyuki Okada , Akiyasu Yamamoto , Kohji Kishio , Shigeyuki Ishida , Akira Iyo
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Hiroshi Eisaki Masaya Fujioka Yoshihiko Takano Marina Putti Jun-ichi Shimoyama
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classification cond-mat.supr-con
keywords ca1-xrexfeas2dopedphasesynthesisarsenidesattemptedbeenbehaviour
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Synthesis of a series of layered iron arsenides Ca1-xRExFeAs2 (112) was attempted by heating at 1000 C under a high-pressure of 2 GPa. The 112 phase successfully forms with RE = La, Ce, Nd, Sm, Eu and Gd, while Tb, Dy and Ho substituted and RE free samples does not contain the 112 phase. The Ce, Nd, Sm, Eu and Gd doped Ca1-xRExFeAs2 are new compounds. All of them exhibit superconducting transition except for the Ce doped sample. The behaviour of the critical temperature, with the RE ionic radii have been investigated.

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