Quasi-two-dimensional behavior of phonon subsystems and the superconductivity mechanism in perovskitelike compounds
Yu. E. Kitaev, M. F. Limonov, A. G. Panfilov, R. A. Evarestov, A. P. Mirgorodsky
DOI 10.1103/PhysRevB.49.9933 · Physical Review B
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Abstract
The results of group-theory analysis, lattice dynamical calculations, and experimental data on the vibrational spectra of perovskitelike superconductors have been considered together. The layer description of phonon subsystems in these materials has been shown to be valid. The quasi-two-dimensional nature of the phonon subsystems has been established. The genesis of the bulk modes has been studied. It has been shown that optical vibrations in these crystals can be divided into 3(NL-1) interlayer and 3(NA-NL) intralayer modes where NL and NA are the numbers of layers and atoms per primitive unit cell, respectively. The interlayer bulk vibrations originate from acoustic layer modes whereas the intralayer modes are induced by optical vibrations of isolated layers. A sandwich conception of the high-Tc superconductivity mechanism is discussed based on the different roles of different layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi4Sr4CaCu3O14 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CaBa2TlCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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