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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 |
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LIU Qing-Qing, WANG Fu-Ren, LI Feng-Ying et al 2008 Chin. Phys. Lett. 25 2239-2241 |
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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.
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| Keywords:
74.72.-h
62.50.+p
10.Nz
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Received: 30 September 2007
Published: 31 May 2008
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