INFLUENCE OF COUPLING MECHANISMS ON THE SYMMETRY OF ENERGY GAP IN COPPER OXIDE HIGH-TEMPERATURE SUPERCONDUCTORS
Corresponding Author(s) : Tran Van Luong
UED Journal of Social Sciences, Humanities and Education,
Vol. 8 No. 4 (2018): UED JOURNAL OF SOCIAL SCIENCES, HUMANITIES AND EDUCATION
Although high temperature superconductivity was discovered in 1986, the mechanism of its interaction (has been) remains a scientific mystery. In this article, the authors present a theoretical model and find the solutions of (the keys for) the self-consistency equation in simple cases. Research results allow to affirm that the coulomb repulsion along with other types of coupling (electron-phonon interaction and spin-fluctuation interaction) play an important role in determining the value and symmetry of the energy gap in copper oxide high-temperature superconductors. The competition between these types of interactions explains d-wave symmetry and extended s-wave symmetry that have been observed in many experiments, and also shows unusual forms of symmetry with vanishing and appearance new nodal lines of energy gap.
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