Combinative energy, oxygen deficiency and superconductivity in LnBa2Cu3O7-x(Ln=Nd, Er, Sm)
Wang Shu-Xia (王淑霞)a, Liu Wen-Li (刘文利)ab, Han Sheng-Hao (韩圣浩)b, Zhang Han (张酣)a
a Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China; b School of Physics and Electronics, Shandong University, Jinan 250100, China; c School of Physics and Electronics, Shandong University, Jinan 250100, China
Abstract The correlation among the combinative energy, superconductivity, oxygen content, the position of holes in different planes, and the position of holes in the Cu(2)-O plane in LnBa$_2$Cu$_3$O$_{7-x}$ (Ln= Nd, Er, and Sm) has been investigated on the basis of a block model. The results indicate that the combinative energy decreases with increasing $T_{\rm c}$ in all of these compounds. And also, the combinative energies are obviously different with holes at different positions in the Cu(2)-O plane when the oxygen deficiency is low. However, this difference becomes less with increasing the oxygen deficiency. The effect of the holes in different positions on the combinative energy supplies some clue to the understanding of an unresolved problem, i.e. whether the distribution of carriers in the CuO$_2$ plane is uniform or inhomogeneous. The results not only show that the structural characters, the combinative energy between two structural blocks and the superconductivity are closely interrelated in this class of compounds, but also reveal some differences among these systems. The relationship between the combinative energy and the $T_{\rm c}$ value in NdBa$_2$Cu$_3$O$_{7-x}$ shows some features different from the systems containing Er or Sm.
Received: 04 April 2003
Revised: 26 May 2003
Accepted manuscript online:
Fund: Project supported by the Ministry of Science and Technology of China (NKBRSF-G19990646).
Cite this article:
Wang Shu-Xia (王淑霞), Liu Wen-Li (刘文利), Han Sheng-Hao (韩圣浩), Zhang Han (张酣) Combinative energy, oxygen deficiency and superconductivity in LnBa2Cu3O7-x(Ln=Nd, Er, Sm) 2003 Chinese Physics 12 1291
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
