Synthesis and Structural Study of Sr2CuO3+δ Superconductor under High Pressure
LIU Qing-Qing1,2, WANG Fu-Ren1, LI Feng-Ying2, CHEN Liang-Chen2, YU Ri-Cheng2, JIN Chang-Qing2, LI Yan-Chun3, LIU Jing3
1Department of Physics, Peking University, Beijing 1008712Institute of Physics, Chinese Academy of Sciences, Beijing 1001903Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
Synthesis and Structural Study of Sr2CuO3+δ Superconductor under High Pressure
LIU Qing-Qing1,2;WANG Fu-Ren1;LI Feng-Ying2;CHEN Liang-Chen2;YU Ri-Cheng2;JIN Chang-Qing2;LI Yan-Chun3;LIU Jing3
1Department of Physics, Peking University, Beijing 1008712Institute of Physics, Chinese Academy of Sciences, Beijing 1001903Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
摘要A single-phase Sr2CuO3+δ superconductor is synthesized under high temperature and high pressure, in which oxygen atoms only partially occupy the apical sites next to the CuO2 planes and act as hole-dopants. The superconducting transition temperature with Tcmax=75K is achieved in the material. Structure analysis from x-ray powder diffraction data show that this material crystallizes into a K2NiF4 structure with tetragonal unit cell of a= 3.795(3)AAand c= 12.507(1)AA. Energy-dispersive synchrotron x-ray-diffraction studies at ambient are performed on powder samples of Sr2CuO3+δ in a diamond-anvil cell at pressure up to 35GPa. Anisotropic compressibility is found. Pressure-induced isostructural phase transition might exist as revealed by the discontinuous change of crystal cell volume V with pressure.
Abstract：A single-phase Sr2CuO3+δ superconductor is synthesized under high temperature and high pressure, in which oxygen atoms only partially occupy the apical sites next to the CuO2 planes and act as hole-dopants. The superconducting transition temperature with Tcmax=75K is achieved in the material. Structure analysis from x-ray powder diffraction data show that this material crystallizes into a K2NiF4 structure with tetragonal unit cell of a= 3.795(3)AAand c= 12.507(1)AA. Energy-dispersive synchrotron x-ray-diffraction studies at ambient are performed on powder samples of Sr2CuO3+δ in a diamond-anvil cell at pressure up to 35GPa. Anisotropic compressibility is found. Pressure-induced isostructural phase transition might exist as revealed by the discontinuous change of crystal cell volume V with pressure.
LIU Qing-Qing;WANG Fu-Ren;LI Feng-Ying;CHEN Liang-Chen;YU Ri-Cheng;JIN Chang-Qing;LI Yan-Chun;LIU Jing. Synthesis and Structural Study of Sr2CuO3+δ Superconductor under High Pressure[J]. 中国物理快报, 2008, 25(6): 2239-2241.
LIU Qing-Qing, WANG Fu-Ren, LI Feng-Ying, CHEN Liang-Chen, YU Ri-Cheng, JIN Chang-Qing, LI Yan-Chun, LIU Jing. Synthesis and Structural Study of Sr2CuO3+δ Superconductor under High Pressure. Chin. Phys. Lett., 2008, 25(6): 2239-2241.
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2008, Vol. 25 
