Journal
EPL
Volume 85, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/85/67003
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Funding
- Natural Science Foundation of China
- Ministry of Science and Technology of China [2006CB01000, 2006CB921802]
- Knowledge Innovation Project of Chinese Academy of Sciences
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We have successfully synthesized the fluoride-arsenide compounds Ca1-xRExFeAsF (RE = Nd, Pr; x= 0, 0.6). The X-ray powder diffraction confirmed that the main phases of our samples are Ca1-xRExFeAsF with the ZrCuSiAs structure. By measuring resistivity, superconductivity was observed at 56K in Nd-doped and 52 K in Pr-doped samples with x=0.6. Bulk superconductivity was also proved by the DC magnetization measurements in both samples. Hall effect measurements revealed hole-like charge carriers in the parent compound CaFeAsF with a clear resistivity anomaly below 118 K, while the Hall coefficient RH in the normal state is negative for the superconducting samples Ca0.4Nd0.6FeAsF and Ca0.4Pr0.6FeAsF. This indicates that the rare-earth element doping introduces electrons into CaFeAsF, which induces high-temperature superconductivity. Copyright (C) EPLA, 2009
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