Relationship between Tc and the modulated structure in Bi-based compounds based on a 2D electron-hole lattice model

✍ Scribed by S. Kuwata; W. Kinase

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 209 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91863-5

✦ Synopsis

We explain the relationship between the critical temperature 7", and the modulated structure in the Bi-based compounds on the basis of a 2D electron-hole lattice model. The 2D electron-hole lattice is constructed on the Bi-O (and possibly on the Cu-O) planes to neutralize local polarization charges mainly caused by the displacement of the Bi (Cu) ions along the c-axis. Assuming that the superconductivity is realized by the exchange of the "phonons" of the 2D electron-hole lattice oscillation, we find that the optimum T,: follows the relation of T~ °Pu 0, D "2, where D, one side of the 2D electron-hole lattice, is related to the local polarization P~o~ through the neutralizing condition

D2ploc=e (e: elementary charge). We examine the validity of this relation for various Bi-based compounds.