Valences of Cu in Y1-x Cax Ba2 Cu3 O6+y
WU Zhi-jian, MENG Qing-bo, ZHANG Si-yuan
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
Valences of Cu in Y1-x Cax Ba2 Cu3 O6+y
WU Zhi-jian;MENG Qing-bo;ZHANG Si-yuan
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
关键词 :
74.62.Dh ,
74.72.Bk
Abstract : The valences of Cu in Y1-x Cax Ba2 Cu3 O6+y have been investigated by using complex chemical bond theory. The results for the valences of Cu(1) and Cu(2) in the calculation suggest that the holes introduced by calcium substitution only reside in CuO2 planes, and there is a competition mechanism for the hole density in CuO2 planes between Ca doping and oxygen depletion. These conclusions are satisfactorily in agreement with experiments.
Key words :
74.62.Dh
74.72.Bk
出版日期: 1998-07-01
[1]
SUN Xue-Feng;YU Jing;WANG Fa;ZHANG Han. Relation of Structure and Superconductivity in Self-Compensating Y1-x Cax Ba2-x Lax Cu3 Oy [J]. 中国物理快报, 2006, 23(8): 2221-2224.
[2]
LIU Yue-Wei;WANG Lu;ZHANG Han. Reconsideration of Orth I and Orth II Phases in Ln-System Superconductors [J]. 中国物理快报, 2006, 23(2): 453-455.
[3]
WU Xue-Wei;NIU Dong-Lin;LIU Xiao-Jun. Photoinduced Spin Disorder in Half-Metal CrO2 films [J]. 中国物理快报, 2006, 23(11): 3072-3075.
[4]
NIU Dong-Lin;LIU Xiao-Jun;HUANG Qiao-Jian;ZHANG Shu-Yi. Determination of Thermal Diffusivity of a Manganite Thin Film [J]. 中国物理快报, 2005, 22(10): 2659-2662.
[5]
TAO Kun;ZHANG Qi-Ren;LIU Ting-Yu;ZHANG Fei-Wu. Origin of the 420nm Absorption Band and Effect of Doping Fluorine in PbWO4 Crystals [J]. 中国物理快报, 2005, 22(1): 215-218.
[6]
ZHANG Qi-Ren;LIU Ting-Yu;YAN Fei-Nan. V- F and V+ K Aggregate Colour Centres: Origin of the Room-Temperature 350 nm Absorption Band in PbWO4 [J]. 中国物理快报, 2004, 21(6): 1131-1134.
[7]
XU Hong-Liang;;FENG Yong;XU Zheng;YAN Guo;CAO Lie-Zhao;LI Xiao-Guang. Enhancement of Critical Current Density in Graphite Doped MgB2 Wires [J]. 中国物理快报, 2004, 21(12): 2511-2513.
[8]
LIU Xiao-Jun;HUANG Qiao-Jian;NIU Dong-Lin;XU Sheng;ZHANG Shu-Yi. Thermal Diffusivity of Ordered Double Perovskite A2 FeMoO6
( A = Ca, Sr and Ba) [J]. 中国物理快报, 2004, 21(11): 2281-2284.
[9]
Atilla COSKUN;Ahmet EKICIBIL;Bekir öZCELIK;Kerim KIYMAC. Field Dependence of Magnetization and dM/dH for Sm- and Gd-Doped Bi1.7 Pb0.3 Sr2 Ca2-x REx Cu3 O10+y Compounds [J]. 中国物理快报, 2004, 21(10): 2041-2044.
[10]
LIU Xiao-Jun;HUANG Qiao-Jian;XU Sheng;ZHANG Shu-Yi;LUO Ai-Hua. Insulator--Metal Transition due to La Doping in Double Perovskite Sr2 MnMoO6 [J]. 中国物理快报, 2004, 21(1): 179-182.
[11]
XU Zhu-An;HUANG You-Xing;ZHAO Yan-Li;ZHANG Xuan-Jia;JIAO Zheng-Kuan. Anomalous Suppression of the Vortex Hall Current in Underdoped
YBa2 Cu3 Ox [J]. 中国物理快报, 2001, 18(9): 1258-1260.
[12]
XIONG Han;CHE Guang-Can;YAO Yu-Shu;NI Yong-Ming;LIU Zhen-Xing;JIA Shun-Lian;DONG Cheng;ZHAO Zhong-Xian. Superconductivity of (R0.4 Pr0.6 )0.5 Ca0.5 Ba2 Cu3 O7-δ (R= La, Pr, Nd, Sm, Eu, Gd and Y) Prepared Under High Pressure [J]. 中国物理快报, 2001, 18(5): 684-686.
[13]
YAN Lei;LÜHui-Bin;CHEN Zheng-Hao;DAI Shou-Yu;TAN Guo-Tai;YANG Guo-Zhen. Highly Conductive Nb-Doped BaTiO3 Epitaxial Thin Films Grown by Laser Molecular Beam Epitaxy [J]. 中国物理快报, 2001, 18(11): 1513-1515.
[14]
YU Ya-bin;CAO Guang-han;JIAO Zheng-kuan. Investigation of Hole Distribution in Y1-x Prx Ba2 Cu3 O7 [J]. 中国物理快报, 1998, 15(7): 525-527.
[15]
ZHANG Ying-zi;YANG Duo-gui;LI Lin;ZHAO Bai-ru;JIA Shun-lian;CHEN Hong;WU Fei;CHE Guang-can;ZHAO Zhong-xian. Epitaxial Growth of Bi2 Sr2-x Lax Cu1 O6+δ Thin Films by In-Situ dc Magnetron Sputtering [J]. 中国物理快报, 1998, 15(5): 373-375.