Physics – Condensed Matter – Superconductivity
Scientific paper
1998-11-19
Physics
Condensed Matter
Superconductivity
35 pages (19 text + 16 figures)
Scientific paper
The complete scenario of high-Tc superconductivity based on experimental data from electron-tunneling spectroscopy on underdoped, overdoped and Ni-doped Bi2212 single crystals using a break-junction technique is presented. There are two different types of superconductivity in cuprates: superconductivity due to pairing of spinons on charged stripes and magnetic superconductivity mediated by spin-waves. The coherent state of the spinon superconductivity is established via the magnetic superconductivity. In NCCO, there is only the spinon superconductivity and the coherent state is established due to the Josephson coupling between charged stripes. Below Tc, we observe four different gaps, namely, (i) a SDW gap due to antiferromagnetic correlations; (ii) a superconducting gap due to spinon pairing; (iii) a d-wave magnetic superconducting gap, and (iv) a small superconducting gap most likely having g-wave symmetry. We show that the d-wave superconductivity is mediated by spin-waves and the magnitude of the superconducting gap due to pairing of spinons is larger than the magnitude of the d-wave gap, however, the d-wave gap is more intense. The superconducting gap due to pairing of spinons most likely has a s-wave symmetry. The maximum magnitudes of the SDW, the spinon and d-wave gaps are located at (p/2, p/2), (p/2, p/2) and (p, 0) on the Fermi surface, respectively. The d-g-wave superconductivity mediated by spin-waves can be considered as a pairing of magnetic polarons. We formulate a theorem for cuprates by analogy with the Anderson's theorem for classical superconductors. The presented model of high-Tc superconductivity naturally explains other experimental data.
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