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Superconductivity in Ba_(1-x)Sm_xFFeAs and Eu_(1-x)Sm_xFFeAs systems

Superconductivity in Ba_(1-x)Sm_xFFeAs and Eu_(1-x)Sm_xFFeAs systems
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摘要 We synthesized the samples Ba1-xSmxFFeAs and Eu1-xSmxFFeAs with ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that the substitution of rare earth metal for alkaline earth metal in the two systems suppresses the anomaly in resistivity and in-duces superconductivity. Superconductivity at 54 K in nominal composition Ba0.5Sm0.5FFeAs and at 51 K for Eu0.5Sm0.5FFeAs is realized, indicating that the superconducting transition temperatures in the iron arsenide fluorides is the same as that in oxypnictides with the same structure. We synthesized the samples Ba1-xSmxFFeAs and Eu1-xSmxFFeAs with ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that the substitution of rare earth metal for alkaline earth metal in the two systems suppresses the anomaly in resistivity and induces superconductivity. Superconductivity at 54 K in nominal composition Ba0.5Sm0.5FFeAs and at 51 K for Eu0.5Sm0.5FFeAs is realized, indicating that the superconducting transition temperatures in the iron arsenide fluorides is the same as that in oxypnictides with the same structure.
出处 《Chinese Science Bulletin》 SCIE EI CAS 2009年第11期1872-1875,共4页
基金 Supported by the National Natural Science Foundation of China (Grant No. 10774135) National Basic Research Program of China (Grant Nos. 2006CB601001, 2006CB922005)
关键词 eAs系统 超导电性 钛酸 超导转变温度 样品制备 碱土金属 稀土金属 电阻率 iron arsenide fluorides, superconductivity, spin-density wave
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