Growth and characterization of superconducting Ca_(1-x)Na_(x)Fe_(2)As_(2) single crystals by NaAs-flux method  

作　　者：Hong-Lin Zhou Yu-Hao Zhang Yang Li Shi-Liang Li Wen-Shan Hong Hui-Qian Luo 周宏霖;张与豪;李阳;李世亮;洪文山;罗会仟(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China;School of Advanced Engineering,University of Science and Technology Beijing,Beijing 100083,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China)

机构地区：[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 100190,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

出　　处：《Chinese Physics B》2022年第11期530-535,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2018YFA0704200);the National Natural Science Foundation of China(Grant Nos.11822411 and 11961160699);the Strategic Priority Research Program(B)of the CAS(Grants Nos.XDB25000000 and XDB33000000);the K.C.Wong Education Foundation(Grant No.GJTD-2020-01);the Youth Innovation Promotion Association of CAS(Grant No.Y202001);the Postdoctoral Innovative Talent program(Grant No.BX2021018);the China Postdoctoral Science Foundation(Grant No.2021M700250)。

摘　　要：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~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_(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_(c) are consistent with previous reports,suggesting a possible connection between the lattice parameters and superconductivity.

关 键 词：iron-based superconductors crystal growth flux method 

分 类 号：O782[理学—晶体学] O511.3[一般工业技术—材料科学与工程]