Volume 85, Number 6, March 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 April 2009|
High-Tc superconductivity induced by doping rare-earth elements into CaFeAsF
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - P. O. Box 603, Beijing 100190, PRC
Corresponding author: firstname.lastname@example.org
Accepted: 23 February 2009
We have successfully synthesized the fluoride-arsenide compounds CaRExFeAsF (RE = Nd, Pr; x = 0,0.6). The X-ray powder diffraction confirmed that the main phases of our samples are CaRExFeAsF with the ZrCuSiAs structure. By measuring resistivity, superconductivity was observed at 56 K in Nd-doped and 52 K in Pr-doped samples with . 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.
PACS: 74.10.+v – Occurrence, potential candidates / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond models, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EPLA, 2009
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