Growth and characterization of superconducting Ca1-xNaxFe2As2 single crystals by NaAs-flux method |
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Institution: | 1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.School of Advanced Engineering, University of Science and Technology Beijing, Beijing 100083, China;4.Songshan Lake Materials Laboratory, Dongguan 523808, China;5.International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China |
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Abstract: | High-quality superconducting Ca$_{1-x}$Na$_x$Fe$_2$As$_2$ single crystals have been successfully grown by the NaAs-flux method, with sodium doping level $x = 0.4$-0.64. The typical sizes of these crystals are more than 10 mm in $ab$-plane and $\sim 0.1$ mm along $c$-axis in thickness. X-ray diffraction, resistance and magnetization measurements are carried out to characterize the quality of these crystals. While no signature of magnetic phase transitions is detected in the normal state, bulk superconductivity is found for these samples, with a sharp transition at $T_{\rm c}$ ranging from 19.8 K ($x = 0.4$) to 34.8 K ($x = 0.64$). The doping dependences of the $c$-axis parameter and $T_{\rm c}$ are consistent with previous reports, suggesting a possible connection between the lattice parameters and superconductivity. |
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Keywords: | iron-based superconductors crystal growth flux method |
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